Can you have too much light? - The Planted Tank Forum
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post #1 of 4 (permalink) Old 08-10-2014, 07:33 PM Thread Starter
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Can you have too much light?

I hava pico-tank (1 gallon) that is hooked up with a desk lamp (bulb is 23W fluorescent), while on the scale of WPG, this is huge. I wonder if you can have too much light, because my plants are growing and pearling, but not getting tall. There are new leaves here and there, but they seem to stop growing taller. Is too much light a problem? I keep it on for 6 hours a day only.

Also my tank had hair algae last week, i overdosed Excel and it proved successful! All of them are gone, my tank went cloudy after overdosing Excel, not sure if related to mini recycle or the excel overage, but anyhow it became very clear after 2 days. But now because the hair algae are gone, they no longer suck up the excess nutrient in the tank, i am experiencing bloom of green slime algae on the substrate, is there any chemical I can use it to treat this? I don't feed my fish often, only once in 2-3 days, bio-load is medium (6 baby feeder minnows)
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post #2 of 4 (permalink) Old 08-10-2014, 09:05 PM
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If your definition of "too much light" is, as mine is, that amount of light that makes it very difficult to avoid algae blooms, then yes you can have too much light, and you almost certainly do have "too much light". Try a 13 watt CFL bulb and see it that helps.

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post #3 of 4 (permalink) Old 08-11-2014, 08:02 PM Thread Starter
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post #4 of 4 (permalink) Old 08-11-2014, 08:15 PM
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I find that 1 Gal is a bit small for any kind of fish. That aside, a 23w desk lamp is quite a bit of light but its workable without algae issues if you keep the tank clean. I use 23w CFLs on tanks from 1 Gal to 5 gals with good results. Replacing the light with a 13w or 15w bulb could give the same results with less issues to manage however.

To get rid of the slime algae you can search for cures for BGA(blue green algae or cyano bacteria) in the algae forum. You can dose with antibiotics, spot treat with excel or physically remove it amongst other things.

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