I just clenaed out my tank and when i wnet to put my fluvalfilter3+ back in i ralised it had stopped working, i panicked and knew my lfs wouldn't be open so i got ma dad to have a look at it, We couldn't work out what was rong untill we took off the head rinsed the motore through then it started working again, just thought i would let you know if any of you have fluval filters and they stop working you know what to do now!