Ok I'm new at this. I bought these circulation fans that are rated at 800 gph. I read that everything is rated for fresh water and you need double for salt water. I read that you want to have circulation at about 10x the capacity of the tank. So this would be 2 fans at 300 gph. I think I went over board. My fish tend to stay still and not swim around too much. They can swim, but when I turn off the fans they seem to move around more. I notice where I bought the fish they were in small tanks with no powerheads. Are they out of shape?or are my fans to powerful?