nitr8
Active member
can you do me a favor and pull out your MP40 and open the wet side and look at the magnet. I have read of a few magnets that for some reason start to rust and affect the water and kill everything, it may not be that since your corals are alive but at least is one thing, i can think of that I have read here in the forum that happen to someone else, and something else to cross out from our list.
I've been having issues with one of my MP40s being louder than the other. Ecotech TS suggested taking the wet side apart and doing a thorough cleaning. The pumps are only 5 months old so the insides are still spotless. Needless to say but no rust. I cleaned both of them while I was at it.