Weird white stuff on the bottom of my tank

[ozeoze]

I noticed this white stuff at the bottom of my tank when I was moving it. Can it be harmful to me or my millipedes? Mite eggs, mold? I have bumblebees, four adults and a lot of babies. Any help would be appreciated.

 

[viper69]

Prob mold

 

[chanda]

It is likely to be mold - unless you have sand mixed in with your substrate. I've found that when I mix sand with other substrate like coconut fiber, some of the sand settles to the bottom of the cage after time/repeated waterings.

 

[HooahArmy]

I'm going to say sand on this one. Fungi form web-like structures under the soil with their mycelium which honeslly do look like spiderwebs streaking about. The mycelium is usually white. I zoomed in on this picture and it looks like sand--sand just like the stuff I mix in my substrate and see at the base of my tanks myself!

 

[CentiPete]

Yup, sand that separates from the substrate over time. Nothing to worry about.

 

[ozeoze]

Yeah, I thought it looked more like sand or something but I'm not sure there is any in my substrate. I use premixed substrate of various kinds, one of them lists limestone as an ingredient, maybe that? I'll be checking if it spreads more though, in case it is mold. I haven't seen webbing or noticed any funky smells there. Thanks for all your responses.