I need some help. Im trying to cycle a 29 G tank with 38 lbs of LR. I have two 900 Maxi-Jet PH, and a RemoraC Skimmer. I put the rock in on sunday and have been just testing the water ever since. Now I come home today and there is some brown stuff civering the LR and live sand. What is going on? I tested the Nirtrite and it is 0. I tested the Nritrate and it is 0. Can someone lead me in the right direction. Should this be happening. Help.