CO2 advice?

[trilinearmipmap]

I can't agree with the comments on DIY CO2. Currently I have 3 plant tanks running: one pressurized CO2, one was DIY CO2 switched to no CO2, one has never had CO2.

For tanks up to the 30 gallon range DIY CO2 is simple easy and cheap. I have never had a smell from DIY CO2. Every two weeks refill the bottle with water/yeast/sugar. As far as the system not working right, it's pretty simple, drill a hole in the cap of a 2 Litre plastic pop bottle, run airline tubing through the cap, silicone it in place.

To me pressurized CO2 for a small tank is overkill. For tanks 50 gallons and up it makes sense.