I was originally going to put a pair or so of green terrors into a 75G, but that died out as my brother wants it so i gave it to him. I have a 20G that's cycled and went to the LFS to get some fish and saw some small GT's around 1-1.5". Would they be OK in this size of tank for a year or year and a half? Just looking for some input, I think I am going to get them.