Hello, can anyone answer this. I'm thinking of EI dosing. I've co2 running at 2bps giving me a 1 point drop on my ph from 8 to 7. As regards to EI dosing I've got all my numbers worked out for the aquarium (55 gallon).I'd be dosing an all in one liquid fertiliser (TNC COMPLETE). My concern is I've a 5"deep gravel substrate which I use root tabs for the heavy root feeders various swords and other stem plants,plus various crypts.Would the root tabs cause my EI dosing go haywire and send my reading through the roof.??? Both the root tabs and all in one ferts contain nitrogen and phosphates.