Nitrates high. Help!

[Ereefic]

55 gal, bak pak2, slowly taking out bio-bale, 3-4"DSB, 90 lbs. LR
We've had Hair algea problems for a few months now. Haven't been able to get it straightened out. Back glass is like the front lawn. Here's test results just taken:

Amm.- 0
Nitrate- 20ppm
Ph- 8.2
Alk- 2.8meq/l
Sal.- 1.025
Temp.- 80
Phos.- .25 (pretty much always been)

Skimmers been pulling about a full cup a week.
4x65w PC's on timers running 12:30pm to 10:30pm
15 reef crabs, had turbos's.....they like to die

Fish might be a tad over stocked.......
1 yellow tang
1 tomato clown
1 Clarks clown
1 coral beauty
1 watchman goby
1 scooter blenny
3 green chromis
1 oscileris(?) Damsel

Feeding fish some flake everyday, none hit's the bottom. Mysis ever couple of days, some of the corals too. We're going to be getting them a better diet. All fish have been fine, no problems, ever.
Thinking of getting a hang on refugium.
Any Ideas? Need more info? Let me know. This algea problem is kind driving me mad. Thanks in advance for any help.

[Ereefic]

Doh! Forgot corals in there. Take a look here and you'll see all we have.

http://webpages.charter.net/wisreef

Thanks again

[Randy Holmes-Farley]

The nitrate and phosphate together could certainy cause an algae problem in any tank.

I'd recommend upping the export of nutrients. Better skimming and/or growth and harvesting of macroalgae would be my recommendation. Setting up a refugium would be the best bet, IMO.

Tossing the biobale is also a good step.

Here's an article that describes issues around phosphate, and some ways to bring it down (many of which willl also bring down nitrate).

http://www.advancedaquarist.com/issues/sept2002/chem.htm