TELL ME WHAT IM DOING WRONG?

[toddmc1967]

I HAVE A 75 GAL REEF 110 # LIVE ROCK 4 TO 5 " SAND BED.THE WATER READINGS ARE 0 AM ,O NITRITE, 30 NITRATE,0 PHOSPHATE,PH 8.28,SAL 1.023,KH 9 ,CAL 450.MY LEATHER LOOKS DEAD,MY XENIA LOOKS ALMOST DEAD,MY GALAXIA CORAL IS ALMOST DEAD.MY SPS CORALS LOOKS GOOD?I HAVE TWO 175 MH 2 96 W PC 1 ATINIC 1 10,000 K.I HAVE A 20 GAL SUMP WITH A RED SEA BERLIN CLASSIC.I DO WATER CHANGES ONCE A WEEK 20 %.I WENT FROM A 55 TO A 75 ABOUT 6 WEEKS AGO.THE SAND IS FRESH.ALSO I HAVE A CALCIUM REACTOR THAT I HAVE NEVER STARTED BECAUSE MY LEVEL IS ALWAYS 450?????????THE WATER I USED GOES THROUGH A RO DE IO UNIT.I FILL 2 7.5 GALLON JUGS WHEN I DO A CHANGE FOR THE NEXT TIME.IT SITS FOR A WEEK.I HAVE A MANDRIN GOBY,SMALL CLOWN ,SMALL ATLANTIC BLUE TANG AND A YELLOW EYED TANG.PLEASE SOMEONE HELP?????IM TRYING VERY HARD.THANKS

[mbeach66]

i don't know if this will help, but it sounds like your corals are suffering from high nitrates. try to lower your nitrates by doing a 10% water change once each day for 3 days. This method usually works to lower nitrates to about 5-10, as your corals are quite succeptable to high nitrate levels.

[brody98]

Do the water changes and check your skimmer. Is it producing any gunky foam?