i believe chaeto will uptake at around 4:1 nitrate to phosphate so if your nitrate is already low or zero'd it may slow the PO4 uptake. if your nitrates are zero you may want to try N+Mo from Pax. a little goes a long way.
my chaeto grows thick and lush if my nitrates are 2 to 5ppm but when NO3 drops to 1ppm or zero it will bleach. To keep my NO3 up i dose N+Mo only (1ml twice a week) and dont run GFO. My PO4 is 0.02 to 0.05 always. I dont have a lot of LR in the tank but have a lot of matrix and siporax in bags in the sump which helps control my PO4
how long have you had it running?
took a few months for mine to bed in and start growing well
my chaeto grows thick and lush if my nitrates are 2 to 5ppm but when NO3 drops to 1ppm or zero it will bleach. To keep my NO3 up i dose N+Mo only (1ml twice a week) and dont run GFO. My PO4 is 0.02 to 0.05 always. I dont have a lot of LR in the tank but have a lot of matrix and siporax in bags in the sump which helps control my PO4
how long have you had it running?
took a few months for mine to bed in and start growing well
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