I have a 9 month old 120 gallon tank and there is some type of fuzzy algae all over the rocks. Turkey baster can’t get these to detach from the rocks. I do 20% water changes every other week. Have a refugium with chaeto and pods. Water Parms are: Alk 187 Ammonia 0 calcium 445 nitrate 32 PH 8.2 phosphate .14 salinity 1.026 temp 78.