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Old 11-18-2008, 02:30 PM   #1
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Lighting vs healthy fish?

I have been doing some reading on lighting and from what I have read it suggest that you need at least 1 watt or a bit more per gallon for fish to be really happy and healthy.
I have a new 75 gallon I am setting up. It came with a 40 watt flourecent single tube light. I don't plan on using live plants so will an upgrade on the light fixture really make any difference?

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Old 11-18-2008, 02:52 PM   #2
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I can't comment on whether the fish will be happy or healthy, but I do know that a 40 watt bulb over a 75 gallon tank looks a bit dim and dingy compared to how it would look with more wattage.

My brother had a 75-gallon tank with a dual 40 watt hood. When one of the bulbs burned out, it looked a lot less impressive.

Something like this will give you way more lumens for not much money:


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Old 11-18-2008, 02:53 PM   #3
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I believe more light brings out or enhances fish`s color but I dont believe their health depends on less light. You should be OK. JMO
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Old 11-19-2008, 12:11 AM   #4
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Goldfish are reputed to grow faster & be bigger & more colorful with high light (preferable outside in the sun). Whether that is due to the light or just better water conditions in a pond, I can't say.

I think you just need enough light for the fish to see. Other than that, I don't think it will make too much of a difference. <And some of the fish that normally live in dark (black) water might not be too happy in really bright light also.>
80 gal FW with 30 gal DIY wet/dry/sump.
9 fancy golds, 1 hillstream loaches, 1 rubber-lip pleco (C. thomasi), 3 SAEs, small school of white cloud minnows, planted.
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light, lighting

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