My green terror had been acting noticeably different and i noticed a bump forming on the bottom of its body. Before i could do anything about it, i found it dead on the bottom of the tank. I pulled him out and this is what the bump looks like. Ive never seen this before in my life. 55gallon tank 2 red parrot 2 clown loach small 1 electic blue jack dempsey and a plesoctomus. Has anyone seen this or know what it is?