Ok so I have micro bubbles getting sucked into my return from my sump. My sump is baffled and I put some LR rubble at the exit of the final baffle. I tried slowing the rate of flow through the sump and might try to reduce it more with the BV after the pump, but don't want to put too much resistance on the pump. Would adding foam in the baffle help? (I've heard of this done before). Is there some sort of mesh I can put in the intake of the bulkhead? It is causing my Zoo's to not open. I hate the troubles of a new tank.