I bought a BTA thoday. After I put it in the tank, it moved around for quite a while and found the location to stay. However, it stays under a rock and face down. Tonight I found that all the bubbles shrinked. Thus I turned the light on again, and it start discharging a lot of silky brown dark thing from its body. Did it die? I have a foxface Lo. in the tank. I just wondering if Foxface might poisoned it?