Okay so we have this old return pump that actually came with the setup when we originally purchased it. The issue has always been that when we turn it off to clean the tank or for what ever reason it had to be hit a little on the side or water pushed back into it. Well tonight has been a different case. I turned it off, but now it wont turn back on, not even with the water being pushed in there with a pump, a little smacking with the hammer etc....

My worry is well of course the obvious.. Will my tank survive with only the 2 MP40's running? And if so how long?

We plan on taking it off and cleaning it on the inside to hopefully clear it of any ditrus tomorrow.