I am running two power filters a 60 and 30 on my 55 gallon tank. I changed the cartridge in the 60 about a week ago and i noticed that the water pressure was coming out a bit weaker now, and the cartridges are only a week old. There is also water coming out of the middle opening where the tube comes up from the tank, anybody ever have this problem??? The intake tube is not clogged but i dont know if there may be a clog somewhere else.