If you are running CO2
, a canister is best. HOB
(& esp. biowheels) will outgas the CO2
quicker than you put it in.
80 gal FW with 30 gal DIY wet/dry/sump.
9 fancy golds, 1 hillstream loaches, 1 rubber-lip pleco (C. thomasi), 3 SAEs, small school of white cloud minnows, planted.