I have some pretty thek cover in a 55 gallon tank. I moved 7 3-8" CNBG and plants from a 150G to make room for the 1500 tilapia I got yesterday. Guess my supplier did well on sorting. He had nine ponds get flooded 2 weeks ago and a tornado hit him last monday. Out of the 1500 T there were the 2 gams and 1 small crayfish.