How long have your fishies been in the tank and how long have they been less active? Also, what kind of flow do you have in the tank? If there is too much flow sometimes fish will head to one side of the tank and hang out there to avoid it. Does it look like they have to work really hard to stay in one spot?
It could also be completely normal. My fish will hang out in one spot quite often.
Last edited by DishyFishy; 07-17-2012 at 11:25 PM.