I dont know why and i dont know how but today after i redid my aquascape i flipped over some rocks and they have GHA, i had been GHA free for the longest time now, my tank is 7 months old ammonia nitrite nitrate and phosphates are all 0 i want a phosban reactor but i dont have a sump or anywhere to place one. I use RO/DI water, bulbs are 5 months old now actinics come on at 12 daylights at 1 daylights off at 8 actinics off at 9 moonlights off at 8am, i dont overfeed but i guess i will have to drastically cut down my feeding now. i have a large CUC full of blue legged hermits, nassarius *sp*snails, nerites, ceriths cleaner srhimp, tuxedo urchin, and emerald crab. only thing i can think of is my bulbs do i already have to change them? and looking on more rocks, its on more than one, i need help!!!!!!