hi all its me again .. im in the process of setting up a larger tank about 120 gal .. with a sump .. about 20 gal ... question 1. would this lead to a large CO2 loss because of the overflow?? 2. if i use a drip system to continually change water at about 10 gal per day would this be OK ?? (good or bad) PLEASE COMMENT ON THIS ESPECIALLY THE DRIP SYSTEM TIA MIKE