it still tries to work but it seems like it's not powerful enough to pull the water to the top to the bio wheels. I've had it for about 7 months and i turned it off today to clean it up. when i plugged it back in, it wouldn't suck the water to the top. i then took it to the sink and did a pretty thorough cleaning, but to no avail. can i maybe get some advice from some of you that might have experienced something similar? i don't want to buy another if i don't have to. btw, i have a 40 gallon tank with a whisper 40 in tank filter also.