I'm keeping inverts for few months now together with mollies, platies, swordtails and guppies and I'm planning to add some freshwater bivalves in my tank when I notice that "pure copper motor" is written in the box of the powerhead I'm using (Venusaqua LED M9902). I been keeping about 20 rcs and 15 nerite snails for more than a month now, and I notice that some of my rcs carries eggs few days after adding them in the tank but some weeks have passed and I don't see any any pregnant rcs nor any shrimplets also I notice that my nerites are mostly inactive and just 2 or 3 of them are actively moving around also most of them stays just above the water surface. I'm curious if the "pure copper motor" got something to do with it. Also if I did add bivalves, will they be alright or will they misbehave as well or will they just die? Thank..