High Phosphate & nitrate
Finally bought NO3 & PO4 test kits. Tested last night and surprise, surprise, PO4 = 5 , NO3 = between 50 and 110. No wonder I had algae.
Did a 30% water change with RO & DI ( 3 GAL RO + 2 GAL DI )
Retested after an hour, PO4 still at 5, NO3 down to 5.
I also removed my carbon from my filter as I read in one of the treads that over time it will increase PO4 (Mine was a little over a month old )
Any other suggestion as to what can be done to bring down PO4 other than water changes. If not how often can I change the water without affecting the biological balance.
20 gal tank, low light, 12 plants, 19 fish.