I just tested my water and got supposedly 0 nitrates (measured twice). You think this is possible? If indeed nitrates are 0 then I must have crazy levels of phosphate (dont have test kit). I added the chaeto a couple months ago but brown algae grows on rock a day after I clean it. Well anyways I did a water change right now (about 40g) since I have not done one since I started setup, then letting it mix with old water and doing another water change later (15g). And going to try to hook up my phospate reactor this week to see if it helps.