I had my tank so sealed up. Heavy acrylic lids and every little gap sealed up. The aro was like 18 to 20 inches. There is a feeding slot on the tank that is like 3x4 inches, and the other night I accidentally left it uncovered. I wouldn't have thought he could fit through it, but he somehow managed to squeeze through it. Found him dried up on the floor with scales lining the feeding slot
. Now I have this 260 gallon with just a Tig, Irwini, and Pearsei. So stupid of me to leave the slot uncovered. Now I don't know what to do with the tank.