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Old 11-01-2004, 03:39 PM   #1
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FOWLR: how much light needed?

I've got the dual 24" NO fixture which came with my 54g corner bowfront

if I buy LR, am I just going to kill all the coralline?

I've got 60lb hirocks in the tank now and it's 2 weeks into the cycle.
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Old 11-01-2004, 03:42 PM   #2
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How many watts total does the 24" fixture have?
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Old 11-01-2004, 03:56 PM   #3
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really not sure... I looked on the all-glass web site and I couldn't tell either.
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Old 11-01-2004, 05:02 PM   #4
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A 24" NO bulb is 20w I believe. On a 55 gal tank, it won't do much to help coralline growth but it should sustain it somewhat. Coralline growth would prosper in a 2ish watt/gal setting heavier on the actinic spectrum.

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Old 11-01-2004, 05:35 PM   #5
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That's my experience also. You won't likely be able to have a ton of coraline, but your LR will still be very interesting and valuable. FOWLR generally suggests that the LR is there only for bacterial filtration to support the fish.

If you've got the lighting to grow coraline, you could probably also keep some corals etc. At that point, you've got a reef tank...whether you intended it or not!
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Old 11-01-2004, 06:22 PM   #6
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I have NO on my fish and inverts with live rock (FAIWLR) . Its a 30" deep tank and I have a decent amount of coraline. What came on my lr remains (mostly on the top pieces). It has spread a bit to the overflows and some on the back glass. My rock looks nice, not reef tank nice but I like it.
Not really worried about it too much, after all I'm in it for the animals.
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Old 11-01-2004, 06:35 PM   #7
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I maintain a 75g tank (FOWLR) that has excellent coraline growth with 80w of NO lighting. One daylight and one actinic. This is a mature tank and cal/alk levels are carefully maintained. I would look into a PC fixture for your bowfront...something with a 2x65w bulb arrangement would work well.
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Old 11-01-2004, 07:51 PM   #8
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I have 80watts NO on my 55 fowlr and it has nice coralline algae growth on the LR. Not that much on the glass. I add nothing to my tank to help it grow either, just water changes to help with nutrients.
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Old 11-01-2004, 08:56 PM   #9
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OK, they're only 2 15 watt bulbs, which doesn't seem like enough to me. I will migrate to a reef tank eventually, but I can't afford the lights yet. if 2wpg is enough, I have my eye on a 2x65 PC fixture that should handle that much.. it's not out of my "soon" price range
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Old 11-01-2004, 09:52 PM   #10
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Is it the coralife aqualight pc? they are very reasonable.
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