anybody ever used this? i did on my new 75 gl tank two saturdays ago, now i have around 30-40 lb of LR and 3 bags of LS , 5 fish, tang-yellow, and 4 damsels, 10 hermit crabs, 2 emrald crabs, and one big coral striped shrimp/crab, nitrites are "0" ammonia "0" PH around 7.9-8.1 water temp stays at...