small bubbles

[eeldarb21]

I seem to be getting a lot of small bubbles in my tank.. the water overflows into the back of the tank where it goes through sevral media filters and bio-balls... then gets pumped back into the tank... i was wondering if anyone has some experience with this and if so what can i do...??? I don't like seeing them and don't know where they could possibly be coming from...both the pumps in the back are fully sumerged.... any suggestions???? thanks

 

[dreeves]

How far below the surface of the water level are the pumps? Too close and a vortex will occur sucking air into the pump...
Ensure your fittings are all tight.
Make sure there isn't bubbles in the water in the sump around the pump.
Many things can cause this.

 

[eeldarb21]

could i just submerge the pumps with more water?

 

[dreeves]

Yes you could just submerge them more...the ill effect of that would be if you ever lose siphon...the pump will still pump the water above its intake into your tank. Unless you have a lot of room to spare in your tank...this could result in a flood.