Actually I think this should be perfect. I'd consider some Salvinia minima to suck up excess nutrients, but past that, I've actually got CRS thriving -- but not breeding -- in a 2 gal.
I do not do water changes. I find they bother them more than anything.
Mine really aren't breeding because the space is too small, but you should be golden.
thats great news
i havent bothered checking my nitrogenous, and dont even have a TDS meter yet. no need while im waiting for the tank to cycle. ill probably check on ammonia and nitrates in a week. and im just using tap to cycle the tank. ill swap it out for remineralized RODI before i add the shrimp.
on the plus side, my plants are actually pearling. and the CO2 is set low (about 1bps), but it seems to be plenty for em: