Advice on my light conditions - The Planted Tank Forum
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post #1 of 3 (permalink) Old 06-06-2013, 07:51 AM Thread Starter
Algae Grower
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Advice on my light conditions

I have a 140 Gallon planted tank. Considering the rule of the thumb. I've lit up the tank with 432 watts (T5 - 54watts 6500k X 4 nos and T5 - 54 watts 12000k x 4 nos, good reflectors in place. The nett result is I have 3.09 watts per gallon. Which I presume is in the borderline of Medium range to High range.

Reference -
less than 1wpg -> unacceptable for plants
1 -2 wpg -> low light to medium low light
2-3 wpg-> medium light to medium high light
3wpg+ -> high light.

Glosso - Light requirements are 3+ wpg or Greater than 1 watt per liter
Mine is 530 liters full.

My tank depth is 30 inches and the light are on the rim. Friends from this forum have felt that is very high light..

P.s - No algae problems, Runs with proper Co2 system. Off late 5% of glosso leaves turning yellow with transparent dots / holes. water temp 80-83. No chiller in use.

Please share your inputs..
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post #2 of 3 (permalink) Old 06-06-2013, 08:01 AM
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I used to push watts per gallon pretty hard with the sidenote that different types of light creat different amounts of usable light for plants. Then I read Hoppys article on PAR.

Give it a read, and you'll see the light...seriously.
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post #3 of 3 (permalink) Old 06-08-2013, 12:09 AM
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Pin holes could indicate lack of potassium. High light coupled with CO2 results in fast growth that will expose deficiencies faster; takes more effort to dose regularly. I've grown tanks with 6 wpg (metal halides) and that doesn't cause problems as long as the other parameters keep up.
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