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Old 05-15-2004, 10:43 AM   #1
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Join Date: Mar 2004
Location: New York, NY
Posts: 90

I'm using a Fluval 304 with carbon in the all the baskets. I was wondering how often I should be changing the carbon. I also plan on running a phospahte sponge in there, since my phospahtes have been holding steady at 0.5 and I already use RO water.

Also, what brand of carbon do people recommend?

29 gallon tank
40 lbs of LR
1.5 inches of LS
Fluval 304
CPR BakPak skimmer w/ preskimmer
Aquaclear 201 and 301 powerheads
Tronic 100W heater
2 20W NO lights
5-stage RO filter

Snail crew, Peppermint Shrimp, 2 Skunk Cleaner Shrimp, Percula Clown, Watchman Goby
flynnternet is offline   Reply With Quote
Old 05-15-2004, 11:15 AM   #2
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Join Date: Sep 2003
Location: Iowa
Posts: 1,437
Every couple weeks is a good top end.. the carbon is usually done adsorbing the junk by then.

I use black diamond or whatever decent brand is on sale.

I have never seen any realtime evidence of carbon "releasing" OC's back into the water after it is "done" adsorbing waste compounds (which it does partially by a chemical bonding of the waste to itself and partially by mechanical filtering) and sometimes I have left a can of carbon in my magnum 350 running for months because I had traded out a bunch of guppies and the bioload got low for awhile. The water stayed fine for me and I believe I had just regular mechanical filtration for that latter time after the carbon's adsorption properties were done for.

Reefrunner69 changes his GAC out once a week in his nano which would be a really safe bet if you dont mind spending an extra buck or 2 a month (which to me is worth it if you have high dollar corals and stuff
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