wpg calculation - The Planted Tank Forum
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post #1 of 4 (permalink) Old 05-26-2004, 12:08 PM Thread Starter
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wpg calculation

When calculating wpg, do you use the nominal tank size or the actual volume? With the nanocube it makes quite a bit of difference as its listed as a 12 gallon, but actual volume is closer to 8 gallons...
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post #2 of 4 (permalink) Old 05-26-2004, 12:39 PM
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Wpg rule of thumb won't apply on smaller tank anyway. My 10gl planted has around 5wpg .

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post #3 of 4 (permalink) Old 05-26-2004, 01:10 PM
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I think that nominal tank volume is used in the watts per gallon rule, but as nino boy infered the rule is only a guide.


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90 gallon, CO2 dupla injection, Dupla substrate heating, Dupla Laterite with iron stone substrate, Aquastarlight future 3 x 150 metal Halides, Eheim 2026 pro2's and heavily planted with Discus
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post #4 of 4 (permalink) Old 05-26-2004, 02:13 PM
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We don't worry about the 'actual volume' of the tank when filled with fish and rocks and substrate and such. Like Paul said it is more of a guideline. The problem is that it isn't really the volume we are worried about but the area and depth (which calculates into volume, yes I know). You want sufficiently strong light spread completely across the area of the bottom of the tank. This is in turn inhibited by the depth (sort of). There is a falloff of available light from a lightbulb as you move away from the lightbulb. The water isn't really deep enough to compound this problem in most of our tanks, it is just a failing of the type of light source.


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