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I have a 75 gallon Fish only Salt Water tank. The tank is filtered using a large wet/dry (6 gallons bio balls), a protein skimmer, a uV strilizer and a recently added Refugium. The tank is fully stocked with a total of 8 fish. List of fish and other general data on the tank is listed below.

I added the refugium to bring down nitrates. The refugium is one I bought on Ebay 12 inches by 4 inches by 12 inches (long hand on version). I pump water from my wet/dry sump to the refugium using a rio 600 (the refugium is mounted on the sump not the tank). In the refugium I have caulerpa ( a little grape, a little feather, and a lot of Razor) and Chaetomorpha Sp. (aka Spaghetti or Brillo Pad Algae). I light the refugium with a 13 watt Jalli light.

The refugium is running for 3 weeks now and to my surprise the nitrates do not appear to be going down ! Can anyone tell me why ? My local fish store claims the refugium won't work, but I've read too much material that says it should... Help ! See more tnak info below.

- Volitan Lion
- Clown Trigger
- Niger Trigger
- Dog Faced Puffer
- Yellow Tang
- Blond Naso
- Cuban Hog
- Greem Birsd Wrasse

-Ammonia and Nitrite are always at 0,
-PH always tends to drop buy is maintained using PH buffer,
- 20 - 25 gallon water changes every 4-6 weeks
- Nitrates at about 40 PPM these days