Some nice shots of our Ornithoctoninae females with their cocoons in their so-called Haplotanks

curtisgiganteus

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Unfortunately, it's just as I thought. First of all, the terrarium is made of plastic. Unfortunately, that scratches over time. Also, the ventilation at the top is far too little. My terrariums have a lid made entirely of perforated sheet metal at the top, which ensures good drying of the top substrate, while the substrate at the bottom, where the spider usually stays, remains sufficiently moist for a long time, which ensures good cocoon care, as the spider with the cocoon can simply choose the right moisture range. Another problem is the small size of this terrarium in relation to the size of the adult spider. One of the participants in the discussion here had made the article I posted about the haplotanks in the BTS Journal available for download. Anyone interested should read it.
I read through the article and the 25cmx10cmx35cm (9.84x3.93x13.78 in inches) seems relatively close to their measurements. I do agree on the glass part. For this style of tank, aside from the ventilation on the front at the bottom and the top being fully ventilated, are there any other points that should be ventilated? I’d like to build my own, however I’d prefer building them according to the specifics of your design.
 

Theraphosid Research Team

Arachnoknight
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If you build the haplotank as I have described in the instructions, the spiders should feel comfortable. By the way, the "ventilation" at the bottom should be at the back, so that a clear view from the front into the tube at the bottom is possible. Moreover, this "ventilation" is not for aeration at all, but is more or less the water inlet when the haplotank is watered. To do this, I place the haplotank in the bathtub and let as much water run in until it is a little bit below the upper ground level. I leave the haplotanks in the water for a night until the soil in them is completely saturated with water again.
 

su3cl3a8

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If you build the haplotank as I have described in the instructions, the spiders should feel comfortable. By the way, the "ventilation" at the bottom should be at the back, so that a clear view from the front into the tube at the bottom is possible. Moreover, this "ventilation" is not for aeration at all, but is more or less the water inlet when the haplotank is watered. To do this, I place the haplotank in the bathtub and let as much water run in until it is a little bit below the upper ground level. I leave the haplotanks in the water for a night until the soil in them is completely saturated with water again.
Hi Volker, if I understand your comments correctly, you can still soak the enclosure even with females that are carrying eggs? I mean literally submerging the spiders and eggs?
 

campj

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Unfortunately, it's just as I thought. First of all, the terrarium is made of plastic. Unfortunately, that scratches over time. Also, the ventilation at the top is far too little. My terrariums have a lid made entirely of perforated sheet metal at the top, which ensures good drying of the top substrate, while the substrate at the bottom, where the spider usually stays, remains sufficiently moist for a long time, which ensures good cocoon care, as the spider with the cocoon can simply choose the right moisture range. Another problem is the small size of this terrarium in relation to the size of the adult spider. One of the participants in the discussion here had made the article I posted about the haplotanks in the BTS Journal available for download. Anyone interested should read it.
A tutorial on building these to spec would be amazing. Maybe a big request though.

It's funny that so many of the species classed as Haplopelma when you created the 'haplotank' have since been reclassified. Maybe we call them 'cyriotanks' now 🤔😉
 

Theraphosid Research Team

Arachnoknight
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Hi Volker, if I understand your comments correctly, you can still soak the enclosure even with females that are carrying eggs? I mean literally submerging the spiders and eggs?
No, under no circumstances should you water the haplotanks when the females have cocoons. Watering only simulates the rainy season, which is also the time when the males run around looking for females, i.e. the mating season. The cocoon building is only hormonally stimulated by the drying of the substrate and by the warmer temperatures.
 

Theraphosid Research Team

Arachnoknight
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A tutorial on building these to spec would be amazing. Maybe a big request though.

It's funny that so many of the species classed as Haplopelma when you created the 'haplotank' have since been reclassified. Maybe we call them 'cyriotanks' now 🤔😉
Here on our WEBSITE you can download the article describing how the haplotanks are built and how they work.
Due to the fact that I do not accept the synonymization of Haplopelma with Cyriopagopus, because it was done very unscientifically and with not useful taxonomic features, I still use the term "Haplotank". ;)
 

me and my Ts

Arachnoknight
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They seem fairly simple to make? Could you not just convert a 20 gallon long (30”x12”x12”) pretty easily?
 

curtisgiganteus

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They seem fairly simple to make? Could you not just convert a 20 gallon long (30”x12”x12”) pretty easily?
You could use a 20 long to house your spider. But it wouldn’t be functionally the same at all.
 

l4nsky

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Due to the fact that I do not accept the synonymization of Haplopelma with Cyriopagopus, because it was done very unscientifically and with not useful taxonomic features, I still use the term "Haplotank". ;)
Was curious about this, but never asked. Haplotank has a better ring to it anyways IMHO, kinda like huwentoxins sound better than schmidtoxins ;) .
 

me and my Ts

Arachnoknight
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You could use a 20 long to house your spider. But it wouldn’t be functionally the same at all.
I mean if you flip the tank to be vertically oriented and then put a piece of glass to cover most of the opening and cover the rest with a door. Finally replace the the top piece of glass with a metal grate for ventilation like the op said. If that makes sense?

By not functionally the same so you mean because it wouldn’t be as skinny?
 

l4nsky

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By not functionally the same so you mean because it wouldn’t be as skinny?
Yes. One of the main advantages of this design is the ability to non-invasively check on a fossorial tarantula in their burrow. In much the same way an ant farm works, the narrowness of the enclosure forces the tarantula to make a burrow with windows. With a 20g long inverted, the tarantula would be able to burrow in the middle and you'll never see it unless it's on the surface or chooses to burrow against the enclosure wall.

EDIT: Also, since there is a renewed interest in this design, there is another benefit to their construction. @Theraphosid Research Team also made a rather interesting discovery on the behaviour of female fossorials with eggsacks and the sun which should be of interest to any current or future breeders here. I'll cross-link that thread here:
A hint how to remove a cocoon from a haplotank without destroying the mother's tube or having to dig it out. ;)
 
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su3cl3a8

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No, under no circumstances should you water the haplotanks when the females have cocoons. Watering only simulates the rainy season, which is also the time when the males run around looking for females, i.e. the mating season. The cocoon building is only hormonally stimulated by the drying of the substrate and by the warmer temperatures.
Yes I'd assume so. Just wanted to make sure. Thank you!
 

A guy

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The best "haplotank" I can make with what I have available here, literally just a cereal container with holes punched as ventilation. She's been in there for about 2 weeks now. At first she was a little bit confused, climbing to the lid, scrunched up in a corner but looks like she's getting settled. She has 10 inches of substrate in there and I think after the failed egg sac I got from her, I should do a better job with her in this enclosure.

20221222_140616.jpg
 

curtisgiganteus

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The best "haplotank" I can make with what I have available here, literally just a cereal container with holes punched as ventilation. She's been in there for about 2 weeks now. At first she was a little bit confused, climbing to the lid, scrunched up in a corner but looks like she's getting settled. She has 10 inches of substrate in there and I think after the failed egg sac I got from her, I should do a better job with her in this enclosure.

View attachment 435081
My C lividus doesn’t want to settle into her haplotank lol
 

campj

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The best "haplotank" I can make with what I have available here, literally just a cereal container with holes punched as ventilation. She's been in there for about 2 weeks now. At first she was a little bit confused, climbing to the lid, scrunched up in a corner but looks like she's getting settled. She has 10 inches of substrate in there and I think after the failed egg sac I got from her, I should do a better job with her in this enclosure.

View attachment 435081
Dang that's a big spider if you've got ten inches of sub.
 

Theraphosid Research Team

Arachnoknight
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I would like to give a few comments from my long experience in keeping Asian tarantulas and dealing with haplotanks. At the end of the 90's I also tried to work with Rotho storage boxes. I burned ventilation holes into the cans with a soldering iron, similar to what was suggested here. Attached is a pic of my system at the time. However, I quickly returned to the glass haplotanks. I could observe that the tubes were not laid out as well as before and that the cocoons often rotted because the substrate on top did not dry as much as it should have. Since I have been keeping the tube-dwelling tarantulas in the real haplotanks again, breeding has also started to work again.
By the way, with Haplopelma lividum it is completely normal that they do not accept the offered tubes at first. Several keepers have observed this in the past with this species. However, we do not know why this is so. Usually they finally start to accept the tubes in the haplotank immediately after the first watering.
 

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A guy

Arachnolord
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I would like to give a few comments from my long experience in keeping Asian tarantulas and dealing with haplotanks. At the end of the 90's I also tried to work with Rotho storage boxes. I burned ventilation holes into the cans with a soldering iron, similar to what was suggested here. Attached is a pic of my system at the time. However, I quickly returned to the glass haplotanks. I could observe that the tubes were not laid out as well as before and that the cocoons often rotted because the substrate on top did not dry as much as it should have. Since I have been keeping the tube-dwelling tarantulas in the real haplotanks again, breeding has also started to work again.
By the way, with Haplopelma lividum it is completely normal that they do not accept the offered tubes at first. Several keepers have observed this in the past with this species. However, we do not know why this is so. Usually they finally start to accept the tubes in the haplotank immediately after the first watering.
As you may have noticed my version of the haplotank is a plastic cereal container. About the top not drying out as much as it should, I'm planning on remedying it by cutting a big piece of the lid and replacing the removed piece with mesh to hopefully better the situation about top parts of the substrate not drying out. Or is this something that you have tried before already and has failed?
 

A guy

Arachnolord
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My C lividus doesn’t want to settle into her haplotank lol
My big female from years ago lived like a terrestrial for 2 years and even molted a couple of times before actually settling and burrowing. I've heard similar experiences from lots of other keepers, not sure why.

Here she was
received_201631271195235.jpeg
 

Mike Withrow

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My big female from years ago lived like a terrestrial for 2 years and even molted a couple of times before actually settling and burrowing. I've heard similar experiences from lots of other keepers, not sure why.

Here she was
View attachment 435128
Mine have done the same thing and I started using a black cardboard backing attached by Velcro and they eventually dug down within a month. I do it with all my Asian fossorial spiders now. See them a lot more of them as well. I started doing this right at a year ago and am pleased with how it helps. Totally different enclosure and stuff I know just something I experimented with that for me actually worked.
 
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