Planted Tank VIP
Join Date: Jul 2002
Location: Winston-Salem, NC
I've used those sponge filters on many tanks, especially for a tank I needed set up quickly, or a quarantine tank. They are fairly efficient, though they need to be cleaned fairly often.
You could insert an airstone into the sponge, right underneath the powerhead, and let CO2 enter the powerhead to be broken up and easily dissolved into the water stream. I use this method (sans the sponge filter) and can achieve fairly good levels of CO2.
- Sam P -
plantedtanker in limbo - all tanks currently in storage