Started my 260l tank 25 April with ADA Aquasoil and 2 x 2028 Eheims with Siporax media, water flow quite good with these two running. Left running for 7 weeks and planted 16 June and dosing CO2 at 4bps - this seems quite high compared to what I read others are doing?. Initially doing a 100litre water change once per week. Have now increased to every 2/3 days. Lighting is 2 x 39w T5's on for 6 hours per day. No fert dosing. KH is currently 4 and PH is at 6.6. Using the CO2 chart this is suggesting CO2 at 30ppm. Fish: 12 Cardinal Tetra, 3 Black Mollie, 5 Flying Fox, 5 Amano Shrimp. Anything else I should be doing?