Added a 2.5 lb co2 to replace my diy bottle. Wanted it to be small since its sits in the open.
My regulator from UP aqua doesn't quite have the same connection. It fits and doesn't leak though.
Based on my estimates I should get about 6 months from it at 1 bps while lights are on.
Having only Ottos in the tank is nice. The only thing I feed is the plants and I could go weeks without doing that. Nitrates are getting lower over time as well.
I am thinking of getting some easy bright colored shrimp and keeping the tank as maintenance free as possible.