So I have had two percula clownfish for the past 2 days. All they have really been doing is staying at the top of the 10 gallon tank behind the filter. I have downgraded the filter from a 5-15 gallon filter to a specified 10 gallon filter. They still just stay up there. Every once in a while the dominant one will come out, but then go right back up there. I know that they dont like currents that much, but this new filter doesnt have much of a current. Anyone have any suggestions?