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post #1 of 8 Old 04-19-2009, 07:12 PM Thread Starter
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Too much lighting?

Is it possible to have too much lighting for any given size of aquarium?

More specifically, I have a 20L. There's an ad on Craigslist for a 130 watt fixture that the seller used on a 29G reef tank.

Don't reef tanks need horse loads of light? Could this be too much for a freshwater aquarium my size?

If so, what would be the effects of too much light?

3 Platies, 1 molly mut, 1 Siamese algae eater, 2 Neolamprologus Facicula cichlids
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post #2 of 8 Old 04-19-2009, 09:53 PM
Yeah you will have uncontrolable algae with those lights. Even if you were using pressurized CO2 and plants. My 20 gal high only has 55watts and grows very dense plants. My 55gal still only has 110 watts......

He was probably growing coral......

.... I'm probably drunk.

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post #3 of 8 Old 04-20-2009, 12:03 PM
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Mikaila31 is right on, you will have algae out of control. And possibly stressed fish from too much light. There needs to be a balance between light, nutrients, and available CO2 for plants to thrive.

The limiting factor for plant growth in a planted aquarium should be the light, as opposed to nutrients or CO2. Too little light and plants will fail to thrive and grow, too much and the plants will use all the available CO2 and algae will flourish because it is better able than plants to get carbon from bicarbonate. Without CO2 addition, no more than 2 watts of full spectrum light should be over a tank.

Byron.

Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
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post #4 of 8 Old 04-20-2009, 12:49 PM
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That's funny.. I never mentioned I used it over a reef tank, and if you would look at the model and picture carefully you would know that there are 2 PC bulbs with separate controls for each.
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post #5 of 8 Old 04-20-2009, 12:59 PM
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What picture?

The most important medication in your fish medicine cabinet is.. Clean water.
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post #6 of 8 Old 04-20-2009, 02:13 PM
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To answer the question, Yes you can have too much light and yes, that light would be too strong for that size tank. If you turned off half the light you could probably use it for a planted tank provided you added Co2 or possibly Excel.
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post #7 of 8 Old 04-20-2009, 03:24 PM Thread Starter
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Quote:
Originally Posted by Unrulyevil View Post
That's funny.. I never mentioned I used it over a reef tank, and if you would look at the model and picture carefully you would know that there are 2 PC bulbs with separate controls for each.
You're assuming the ad I saw was yours? Sorry, I live in Texas, not New York.

Thanks folks. I'll keep my eyes out for something different. ;)

3 Platies, 1 molly mut, 1 Siamese algae eater, 2 Neolamprologus Facicula cichlids
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post #8 of 8 Old 04-20-2009, 05:39 PM
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wow this is weird! I have exactly same thing for sale hehe (with picture)
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