No idea. Never lost a fish in this tank. I put it in last night he was fine. I wasn't home threw the night. Stayed at my girls family's.. came home and he was becoming crab food. Took him out right away.. only thing I noticed yesterday was my sailfin was kinda messing with it but no were enough to kill it. At least I didn't think so. But he went from qt.. to the regular system to my system in one day. If that may of stressed him out... I alc him for a good hour... ? Sucks. Was not the cheapest either.. was super excited when u said you really liked yours lol.
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