Make sure you have a very tight fitting lid. I had one escape out of the tiniest hole where my powerheads' cords were routed out of the tank. I couldn't believe it when I found him dried up next to the tank! They hole was about 3/4" diameter and it had two cords routed through it.
Pure torture!
I lost an eightline wrasse thru something similar. Blows my mind they can find the tiniest of places.


