Going around in circles - The Planted Tank Forum
 
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post #1 of 10 (permalink) Old 03-07-2009, 11:01 PM Thread Starter
kor
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Going around in circles

Sadly the plans for the 55g tank have gone on indefinite hold for space reasons. Fortunately, there's room for a smaller tank, no more than 2' long. That presumably means a 20g (tall) tank. The problem is lighting. Stock lighting doesn't look like it's going to be enough, and none of the other options look right either. I've seen a 24" compact fluorescent fixture, but that puts out 65W. If the 100W of T5 was too much for the 55, then 65W of CF is presumably far too much for a 20g without CO2. There are also 24" T5 fixtures available, but those put out 48W, almost certainly too much as well.

Is there a happy medium somewhere?
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post #2 of 10 (permalink) Old 03-08-2009, 12:46 AM
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I have a 20g tall with a 48w T5 fixture on it, and with only excel as a carbon source, haven't had any problems. Pretty high plant and bio-load.
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post #3 of 10 (permalink) Old 03-11-2009, 02:03 PM Thread Starter
kor
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Do you run all 48W all day, or run only 24W for most of the day and just burst the other 24W around noontime?

Any other suggestions for lighting suitable for non-Co2 for a 20g (tall)?

Thanks again!
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post #4 of 10 (permalink) Old 03-11-2009, 02:59 PM
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You can always go back to basics: use a couple of 24 inch T12 or T8 bulbs, with a white painted "reflector". Why go for high tech lighting for a very low tech tank?

Hoppy
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post #5 of 10 (permalink) Old 03-11-2009, 03:03 PM Thread Starter
kor
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Hoppy - because I can't find dual T8 or T12 fixtures for a small tank, while oddly it seems that 24" T5HO and PC fixtures are everywhere.

If there were a (reasonably priced) tank-mounted (can't do something that hangs from the ceiling) T8 or T12 dual bulb alternative, I'd be all over it. Actually, to find something like that was my motivation for making this post in the first place. I've seen such things for larger tanks, but never for small ones.
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post #6 of 10 (permalink) Old 03-11-2009, 03:05 PM
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you could also do a 'normal' T5 fixture (not the HO). Here is a link to one, but its Salt Water which means it has an artinic bulb and a 10,000K bulb.

http://www.bigalsonline.com/BigAlsUS...lestriplight24

There are also T8 fixtures on there as well.

John



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post #7 of 10 (permalink) Old 03-11-2009, 03:08 PM
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The Drs has some:
http://www.drsfostersmith.com/produc...2&pcatid=13612

Walter

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post #8 of 10 (permalink) Old 03-11-2009, 03:10 PM
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Nova makes a T5 HO that is 2x24w 24" (48w total). One lamp is 10k full spectrum one is a fresh water (pink). If needed you could remove one for just over 1wpg until things start growing, then think about adding the second light.
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post #9 of 10 (permalink) Old 03-11-2009, 03:12 PM
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Careful about removing bulbs from a fixture with mulitples... my fixture does not run on just one lamp. It may have something to to with electronic ballasts, but I'm no expert here.
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post #10 of 10 (permalink) Old 03-11-2009, 04:11 PM Thread Starter
kor
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@tazcrash: That's an interesting alternative, but the problem with such a dual hood is that it's not meant for open-tank use - it requires a glass top to sit on. Is there any similar alternative that's meant for an open-top tank? Or should I just give up my notion of running open-top?

@jjp2: Also an interesting suggestion, but I don't see a whole lot of T5NO replacement tubes - when one goes out on that fixture, how do I replace? As far as I can tell, drsfostersmith don't carry any?

@dmaxxxx: to address Regloh's question, do you know if that particular Nova light can run with only one bulb?

Thanks again!
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