I have a small planted mbuna cichlid tank (just a 29G with a couple of fish in it). I keep the cichlids well fed with multiple small feedings so theyve mostly been ignoring my plants. I have some vallisneria, some java fern and moss, and some anubias and I would like to give them a healthier environment. I'm building a DIY CO2 delivery system, but my question is how do I know when the CO2 hits about 25ppm? My pH is about 8 to 8.2 with my DKH at about 12 (before any CO2 injection) and I can't figure out how to extrapolate my CO2 measurement from these numbers. Also, would I need to fertilize in unison with the CO2 to notice any real growth, or would the CO2 alone provide an increase in growth? I have about 1.5ish WPG of t5 light, which should be enough for these low to low medium light plants. Thanks for any help.