As an example my 15-UK gallon tank runs pressurised CO2 and 30w of light (~2wpg, a little higher if you go for US gallons). I currently dose EI as per the pinned article but am curious at what wpg levels (for this tank) would Tropica PN+ be a suitable alternative? I'm thinking running ~1.5wpg would be more suited to PN+ but am not exactly sure?