I have used Fluval Stratum and it has grown my plants fine. I am just wondering if after a while I may need to add fertilizers to the soil. It has been running for 2 years and I recently decided to re-do the aquascape with new plants this time. I know ADA aqua soil has buffering properties that run out at around this time (2 years) but does the nutrients in the soil also decline? Are the nitrates and fertz to the water column enough? My Rotala Colorata is becoming greener even though I am dosing Thrive and Seachem's Iron.