When does Watts Per Gallon stop working?... - The Planted Tank Forum
 
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post #1 of 5 (permalink) Old 09-23-2003, 09:28 PM Thread Starter
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This is something that I have been pondering since I setup a 5 gallon Nano planted tank. The plan was to use 10 watts of CF to light the tank and to plant Glosso and a few other plants. The general consesus was that even though that was 2 wpg in a short tank it would not be enough. I am going to add a second 10 watt CF upping the wpg to 4. But enough about my particular problem

At what point does the Watts per gallon rule break down? Is it a certain tank size or tank dimensions? And when it breaks down how do you figure out what you need for low, medium and high light plants?

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post #2 of 5 (permalink) Old 09-23-2003, 10:16 PM
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Between 20-75 gals, 3WPG is pretty accurate. Below about 10 gals you need more light, above 100 gals you can get away with a little less. Factors such as tank depth, reflectors and water clarity should also be taken into consideration. These are general guidelines. As to How do you know when you have enough light, you're plants will tell ya.

Marcel

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75 gal heavily planted,50/50 Black beauty,Eco-complete substrate, Pressurised CO2 with solenoid, ph controller, AB Reactor 1000, 330 watts 9325K GE PC lighting,Ehiem Liquidoser, 2-Filstar xp3 canisters.
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post #3 of 5 (permalink) Old 09-23-2003, 10:54 PM
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Marcel is right. I have seen no hard and fast rule for this. There are many factors involved....I dont know them all...depth being the biggest in my opinion. Take notes...see what works then post it here...we can all benefit from that.

mike

PS enjoy the plants!

Mike
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10 Gallon...20 Endler's live bearers planted, peat/kitty litter/sand substrate

15 Gallon...Just Schultz Aquatic Plant soil
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post #4 of 5 (permalink) Old 09-24-2003, 12:08 AM Thread Starter
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Practice does make perfect and experience is a great teacher, i hope to start a journal for this tank in the photo section so everyone can see what happens :-D

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post #5 of 5 (permalink) Old 09-24-2003, 12:24 AM
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Quote:
Originally Posted by m.lemay
Between 20-75 gals, 3WPG is pretty accurate. Below about 10 gals you need more light, above 100 gals you can get away with a little less. Factors such as tank depth, reflectors and water clarity should also be taken into consideration.
Another thing we should take into consideration is which plants you want to grow. If you are talking Swords, Cryptocorynes, Java ferns, and another about 80% of commonly available plants, you can get away with considerably less wattage (provided you have good reflectors). As soon as the G-word (ends with "lossostigma") emerges, we talk high light, high ferts, high CO2, and high bills too.
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