I plan on purchasing additional live rock (I will certainly cure it in a separate tank!) to help with the water quality, hiding space, visual appeal, etc. My particulars: -75 gallon: setup early January 2005 -Coralife PC lights (260 watts: 130w 10k, 130w actinic) Added 6-8 weeks ago. Used standard bulb that came with tank setup for the first couple of months (skimmer took precedence of my $). -45 lbs live rock + 30 lbs dry rock -Eheim 2217 canister filter with carbon added -2 Maxijet 900 powerheads -4-5 inches of aragonite substrate Live stock: -Red flame hawk; Yellow tang (small); False Percula clown; Royal Dottyback -10 hermit crabs; 30 snails Water Quality: Ammonia: 0; Nitrite: 0; PH: 8.2; Nitrate: 10-20; Phosphate: 0.1; SG: 1.023 Carbonate Hardness: 200+ (this puzzles me because it consistently reads so high) Change 10 gallons of water every 2 weeks Oceanic Salt