Right now I’m mostly going for a low tech set up so I feel like co2 is a little too advanced for me (this is my first planted tank lol so I’m okay with the trial and error). I am dosing a minute amount of excel (liquid carbon) to help stimulate the plant growthPerhaps some CO2..? Wouldn't necessarily need a mega expensive pressurised tank.. There are plenty of cheap biological reaction setups put there - I've just set one up myself and very happy with it.