Need comments on sumps and Co2 systems. Do I take out bio balls? Will i have loss of co2 from sump? My sump has a cover over intake compartment, but the return compartment is open..should I seal the open compartment w/plexi glass and duck tape? Any other info? Thanks all....

You need to seal the wet/dry chamber(tape etc).
Raise the level in the over flow to 2-4".
Everything else is similar though..........

Regards,
Tom Barr