On my 125g, I have (2) filstar xp3's canister filters. One of them after cleaning it, I can't get it work. I filled the tubes up with water, turn it on, it runs for about 10 seconds but then it stops pumping the water through the canister. I have used these filters for years but this has me stumped. It is only 1 year old. The magnet is not cracked. Any suggestions?