I have a tomato clown in a 20g tank at my parents house and while I was staying there overnight I noticed the clown didnt move around much.He stayed in one corner of the tank or specifically one side. The tank is nice and psaced out there are no other fish in there and he just stays in one area. Could it be that there is too much current for him and thats the only spot where its not so strong. I am using a Marineland Penguin 170 biowheel filter alond with some LR as a biological filter. I know the filter is for a 30g but thats all they had left. So is the current to strong?