3 gallon light - The Planted Tank Forum
 
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post #1 of 8 (permalink) Old 03-10-2009, 12:13 AM Thread Starter
 
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3 gallon light

Hello PT. just a question. Hopefully this is in the right section.
Is 9 watts on a 3 gallon enough to grow low light plants? or Is it too little?
and also is 18 watts too much for a 3 gallon?

i know that watts/gallon doesnt work for very small tanks.

the tank will have about 2.5 gallon of water when filled after the decoration.
also its foot prints is 12L x 8W x 8H
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post #2 of 8 (permalink) Old 03-10-2009, 12:20 AM
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9 would suffice for maybe anubias/ ferns. 18 would be good if you wanted to do diy co2 or excel

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post #3 of 8 (permalink) Old 03-10-2009, 12:37 AM Thread Starter
 
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oh ok, thanks. yeah i was just thinking about growing only anubias and ferns... maybe hm and mm. im gonna dose excel and maybe pps pro once or twice a week. so 9 watts is good to grow?

i trust you on this cl but i just want to know what other thinks. ive always admired your tanks, especially your first 30c with the round rocks and petite nana.
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post #4 of 8 (permalink) Old 03-10-2009, 01:16 AM
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I agree with cl on this. Nine watts should be fine for low light.

Of course, the type of bulb and how far it is from the substrate are factors as well.
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post #5 of 8 (permalink) Old 03-10-2009, 01:32 AM
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You could do two 9 watt lamps on timers so that you have an 18 watt burst for a while. Excel would definitely help out on minimizing algae. I had a 20 watt lamp (diy with cfl bulbs) on a 2.5 gallon tank a few inches above the tank and didn't dose or do co2 and got 0 algae. I had Aquasoil Amazonia Powder form as my substrate.

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post #6 of 8 (permalink) Old 03-10-2009, 02:31 AM Thread Starter
 
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Quote:
Originally Posted by Ugly Genius View Post
I agree with cl on this. Nine watts should be fine for low light.
Of course, the type of bulb and how far it is from the substrate are factors as well.
its gonna be a pc bulb, between 7-10 inches away from substrate.
also which is better?
-9W Daylight 10000ēK Bulb
-9W Full Spectrum 6700ēK Bulb

ill try to keep this low tech as possible. well no co2 but excel as carbon source
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post #7 of 8 (permalink) Old 03-10-2009, 02:51 AM
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It's a choice based only on aesthetics. The sixty-seven-hundred's more yellow to the ten-thousand's bluer hue.
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post #8 of 8 (permalink) Old 03-11-2009, 04:53 PM
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I used 23w spiral CF & 2x13watts CF bulb to grow out the plant for my last two 3 gallons tank

I think 9 watts is probably too little for plant growth, 18 watts should be good for low/med light plant and for "maintaining" a grown out tank

traditional sense of WPG means close to nothing on such small tank.
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