new set up 360 gal ,saturday i found all my fish on top of the tank and breathing real hard ,so i paniced and took my water to lfs ,i cant find my test kit ,point to this he told me my nitrites were high to do a 30% water change and add water stabelizer i did that everything was good ,except im running one fx5 the other one i have stopped working i have to get another one this week in the mean time im runing a marineland 350 with the fx5 i have a airstone on on one side of the tank and a powerhead on the other do you guys think its just not enough filtration right now ? all comment s are very much welcome as well as advice ,oh by the way 55 gal sump is in the works !