Ok, so I have no idea what is going on but in less than a week, four filters have gone belly up. First, my two Marineland Bio-Wheel HOB filters fizzled out when my son tripped on the powerstrip they were plugged into. They were still working, but the output was reduced to nothing more than a trickle. I tried emptying them, refilling them, changing the outlet they were plugged to, changing the water level in the aquarium...NOTHING HELPED. So I put those two away and took out the canister filters. I had gotten a couple Aquatop (once Sunsun/Perfecto) canister filters to use in emergencies like this and so I hooked them all up and they were working great. Until today. I unplugged them for todays water change and when I plugged them back in, nothing more than a trickle. It's so weak it's not even able to make it all the way up the tubing. This is really agitating and I am not about to plug more filters in just to have them ruined. If anyone knows what's going on, PLEASE HELP!