this is what it looked like on the 24th of March This is what it looks like now 5.5g PH 7.5 KH 5 Ammonia 0 Nitrite 0 Nitrate 10ppm (tested late in afternoon) Phos 1ppm I dose pfertz system Excel 1mL no CO2 40-50% WC on sundays 24w CF 9 hours/day 3 changes made 1: Swapped ferts from seachem to pfertz. Last seachem dose was on a saturday the 22nd, 50% WC on the 23rd, 50% WC 25th, started pfertz on 25th. Continued excel during this time. 2: Major trim of Rotala. Don't remember what day that was though... 3: Added Eheim 2213 canister filter. I'm running both my HOB and the canister at the same time until the canister builds up a good bacterial colony. The HOB is on the left back corner of the tank and the flow goes from back to the front. The spray bar for the canister is on the right side spraying to the left. Most of the bad growth is in the right rear corner on the ludwigia and in the center on the nessae, but it's really everywhere. That was maybe 10 days - 2 weeks ago I know some of the algae is BBA... but it's only growing in one or two small spots on a section of driftwood. The stuff covering the nessae and ludwigia is a very dark green. I wondered if maybe it was BGA? or if it's some other sort of algae. I have cherry and amano shrimp and an oto and none of them seem to touch it.