[Delphinus]

Thanks for the comments. I guess I should have mentioned, but before I had actually asked the question originally, I actually did already have a spare small CO2 cylinder that I just wanted to put to some use.

For now I've just put a small bubble rate going. About 50 bpm is what it's at. It barely bumps the pH down (without it the pH is about 8.5, with it ... maybe 8.3). My water is dang hard (not using RO in this tank .. should I?)

Haven't adjusted fertilizer, haven't added iron or anything like that, no lighting adjustment as of yet. But the anubias have started growing like there's no tomorrow so something's happening.

My next issue to resolve before I get into fine-tuning the CO2 or the fertilizers is to fix my lighting problem. I currently have 4x20W NO lights over this 30g tank, that should theoretically yield me 2.7 wpg but in reality it's nowhere near that since one of the pairs seems to have an issue (ballast maybe?) where the lights stop lighting after about 1 month of use. I haven't decided whether I want to to fix the current setup, replace it with PC maybe, or whatever. In a separate thread I had asked about switching to 150W DE halide (since I have a DIY fixture and a lamp and a ballast, all sitting around unused anyhow, that could get put to some use), but I seem to recall I had been more or less talked out of the idea. I dunno .. what do you guys think? Stick with NO, go to PC, or to heck with it and go with the 150W DE? The halides are the cheapest option believe it or not, since all the equipment is there. The other two would involve a purchase of some kind (new ballast, or new fixture, or new DIY supplies, etc. etc. etc.)