Work on the CO2. Make sure it is around 30ppm or excess within critters limit throughout the entire photoperiod and then switch it off at night. Get some slight surface going as well but not too much. Nutrients are easy via regular consistent dosing routines.
Routine suggested.
Remove algae/trim plants/scrub glass and etc.
Clean filter if flow drops or whenever you remove algae.
50-70% water change
1/4 teaspoon of KNO3 once a week and maybe 2x a week when things do well
1/32 teaspoon of KH2PO4 once a week along with KNO3.
Traces at 3ml 2x a week
Make sure the CO2 stays high and good for the entire photoperiod and throughout the routine or else nothing will work well.
Whenever you have algae issues or lull in pearling, check the CO2 carefully and even if the readings seems perfect, add a bit more CO2 and see if things improve.
Regards
Peter Gwee
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