This is my mom's account, I'm not allowed to have forum accounts yet because I'm only 11 but she said I could post here after reading about your C. darlingi getting sick.
I'm sorry your tarantula died, I would be pretty sad if any of mine died. I think your sling maybe was dehydrated. You have to remember that little slings don't even have a drop worth of water in their tiny body and a drop of water can evaporate pretty fast. You said that he was getting better when he was in your ICU container, I think you should have left it there for at least a few days rather than move it out when it was doing better and then back when it was getting sick again. You shouldn't blow on your tarantulas because they have little hairs all over their body for detecting vibrations. When you blow on them you are making all of those hairs move all at once and my mom says its like someone taking a can of air and pointing at your face. Not nice.
I don't think you should breed tarantulas until you know more about them. I want to breed them too but I was reading the other day about making different seasons happen to get them ready and to make the female lay an egg sack. It looks like more work than just putting two spiders together and hoping it all works out. I don't think you should buy any more tarantulas right now either. I looked on your profile and it says that three have died? That's kind of a lot, you should read more about the species you have instead of buying more.
Dont be mad because I said that, it's just not a good thing when animals die because of something that could have been fixed.
I'm sorry your tarantula died, I would be pretty sad if any of mine died. I think your sling maybe was dehydrated. You have to remember that little slings don't even have a drop worth of water in their tiny body and a drop of water can evaporate pretty fast. You said that he was getting better when he was in your ICU container, I think you should have left it there for at least a few days rather than move it out when it was doing better and then back when it was getting sick again. You shouldn't blow on your tarantulas because they have little hairs all over their body for detecting vibrations. When you blow on them you are making all of those hairs move all at once and my mom says its like someone taking a can of air and pointing at your face. Not nice.
Dont be mad because I said that, it's just not a good thing when animals die because of something that could have been fixed.