Ok...First question.. What additives do I need to use? I don't think I need all of the additives I'm using. Second question... Should I put in a small REFUGIUM keeping my remora on the main tank? Third question... I have about 2" of crushed coral for a substrate. My LFS said to get rid of it. Should I change this to live sand, and more of it? This setup was running for about two years before I got it four months ago. This is my first experience with an aquarium. I've got the water crystal clear and I have no problems with anything dying. It's a 75 gal aquarium. There is about 100lbs of LR covered in coraline. I'm running a Remora pro, a Cascade 1500 filter W/O the filter media (for more circulation), three Aqua Clear powerheads and a PC with 260 watts total. With the setup I got a bunch of additives. Zoe (kent), Phtoplex (Kent), Coral-Accel (Kent), Strontium&Molybdenum (Kent), Trace Elements (Kent), Vitamin C (Kent), Garlic Xtreme (Kent), Lugols Ionine (Kent), BIonic 2 part, I think thats it. My Nitrates consistantly run at about 10 to 20 ppm everything else I test for is perfect. Calcium runs 450 to 500 with B ionic added 3 times a week. The list living things goes as follows...Fish...2 Percula Clownfish, 2 Clarkii clowns, 1 Fan Dance Goby (brackish), 1 large Yellow Tang, 1 Large Hippo Tang, 1 Lawnmower Blenny, 1 Firefish Goby, several large feater dusters, a Serpent Starfish, 1 Coral Banded Shrimp, 2 PEPPERMINT SHRIMP , 1GREEN CHROMIS, SPRINGER'S DAMSEL, ZEBRA HERMIT CRABS , RED LEG REEF HERMIT CRABS, 2 engineer gobys, 1 large carpet Anemone and a Rose Anemone....Corals GREEN HAIRY MUSHROOM Medium - 3.5" to 5", RICORDEA MUSHROOM Medium - 3.5" to 5", 1 CHILI CACTUS SOFT CORAL SMALL, 1 CHRISTMAS TREE SOFT CORAL SMALL, 1 CLUSTER GREEN MUSHROOM LARGE, 1 Bubble Coral, 2 LARGE Colony Polyp. 2 LARGE Star Polyp, 1 OPEN BRAIN, 1 TOADSTOOL CORAL, Rhodactis sp.(Elephant Ear Mushroom), 3 branches of frogspawn, large branch of alveopora. Ok... Lets let the experts take it from here.