ANYONE THAT HAS ANY SUGGESTIONS PLEASE FEEL FREE TO GIVE THEM TO ME... I HAVE A 75 GALLON TANK WITH A RENA XP3 FILTER WITH INLINE 13 WATT UV STERILIZER, AQUA-C REMORA SKIMMER, AQUARIPURE DENITRATOR, LARGE POWERHEAD WITH HIGH GALLON TURNOVER RATE. MY LIVE SAND BED IS ABOUT 2 INCHES DEEP AND I HAVE ABOUT 50 POUNDS OF LIVE ROCK. MY LIVESTOCK ARE 1 FOXFACE RABBIT FISH, 1 TANG, I CLOWNFISH, 2 GREEN CHROMIS, 1 BLUE DAMSEL, 1 GREEN MANDARIN, 1 SIFTING SAND STAR, SEVERAL HERMIT CRABS AND ABOUT 75 VARIOUS SNAILS. I HAVE NEVER BEEN ABLE TO GET MY NITRATES UNDER 20 AND THEY USUALLY RUN 40. I HAVE BEEN DOING WATER CHANGES TWICE A WEEK. 9 GALLON CHANGE FOR ABOUT A MONTH NOW AND NOTHING SEEMS TO CHANGE THE NITRATE LEVELS. PHOSPAHTE LEVELS ARE ALMOST NOTHING. CALCIUM IN IN THE NORM. MY SALINITY IS RIGHT ON THE MONEY. HELP HELP HELP....... 