dang you read up a lot, didn't you? what about your phosphates? check those too. 65 gallons... 192 VHO... that probably shouldn't be too bad to start out at all. be careful of PH shifts with the DIY co2... a tank that size will be better off with pressurized, but feel free to start with DIY to try it out. the only recommendation i have is...
larger water changes
there, that should stand out

the only reason i say more is because you probably won't fertilize perfectly in the beginning, so if you change 1/3 or 1/2 of the water every week or so, you'll keep nutrients from shooting off the chart. just a bit of a safety net

i don't know if the tank should have different properties since it's an african tank... but it looks like you're on the right tank. a cichlid lover can let you know about your water chemistry. sounds good so far, i hope our advice leads to plant growth, not algae and dead cichlids

welcome to the forum!
JP