So I realize this may be a long shot but does anyone have a penguin biowheel 200 filter? Here's what happened: I emptied my fish into another cycled aquarium so I could completely empty my 33 gal and change from gravel to sand. Today I put in the egg crate, and decorations and sand and water and such, and I turned my filter on so I could do a fishless cycle while they're in the other home. I put some water into the filter as it was going so it could actually get started , and it was working and all but kinda with a strange noise. After like 10 mins at most, it stopped sucking water up and emptied all the water inside it then went quiet except for a little hum noise. Yes I have a sponge over my intake and I was watching to make sure no sand got sucked up and it seemed all good. Do I have to buy a new filter or is this some sort of trivial thing?