hey all justa newb question. i recently thought my 12x12x8 tank cycled after about 3 weeks but now im not sure. i started tank with about 2 gallons old reef water and 3 new. 4 lbs of real reef rock and 5lbs tahitian moon sand. i saw the ammonia go up, then down as nitrite came up, then trites went down. then no amm or trites and i saw trates. i even saw a lone green/brown paly living on the rock, thought all was well. i added a chromis and all was wel for about 3 days, then he stopped eating and got cloudy eyes then died. after his death i noticed another diatom bloom? what gives? any help?? i tested again and am 0 trite 0 trate 10-15.