I have an empty 55 gallon tank and was wondering what the biggest fish i could put in it so it would be comfortable and if so are there any other fish that could ge with it
Most non-shoaling fishes that aren't spastic or overly fast moving that grow about 12".
I would suggest you find some fish sites with profiles for you to read over. There are lots of fish options. I always liked these sites... www.aquariacentral.com www.mongabay.com