Enough light?? - The Planted Tank Forum
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post #1 of 28 (permalink) Old 12-02-2011, 03:36 PM Thread Starter
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Enough light??

I have a 36x18x24 65 gal tank. I have plants in it, (week ago) no co2 if possible. I have 4x39w t5HO at 10000k, but am only using 2 at the moment. Is this good enough or what? Do I need diff. bulbs, more or less bulbs. Help Please!!

Thanks for any info.
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post #2 of 28 (permalink) Old 12-02-2011, 03:38 PM
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UMMM with that lighting Co2 WILL be required.
2 T5NO would actually be better than the HO since you arent using Co2.
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post #3 of 28 (permalink) Old 12-02-2011, 03:53 PM Thread Starter
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would diy co2 help or maybe excel...I am only using 2 bulbs about 4 inches above tank..the chart says that would be medium light..Am I correct in reading that.
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post #4 of 28 (permalink) Old 12-02-2011, 04:09 PM
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Quote:
Originally Posted by denboka View Post

would diy co2 help or maybe excel


I am only using 2 bulbs about 4 inches above tank..the chart says that would be medium light..Am I correct in reading that.

DIY Co2 is not recommended for larger tanks due to inconsistancy, not matter what you do you will fail keeping it consistant and end up with BBA everywhere. Excel can help, but that also depends on the plant life in the tank.



36x18x24 4" would be Med...You will have to keep and eye on it, and play with the photoperiod.

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post #5 of 28 (permalink) Old 12-02-2011, 04:12 PM Thread Starter
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i currently have 12 hr photoperiod...I am waiting for my fert to arrive..currently dosing flourish 2x week and excel daily. any thoughts.
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post #6 of 28 (permalink) Old 12-02-2011, 04:37 PM
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i currently have 12 hr photoperiod...I am waiting for my fert to arrive..currently dosing flourish 2x week and excel daily. any thoughts.

You mean trace and flourish?
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post #7 of 28 (permalink) Old 12-02-2011, 04:50 PM Thread Starter
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just the flourish comprehensive2x/wk and excel daily
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post #8 of 28 (permalink) Old 12-02-2011, 05:11 PM
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12hrs is to long, 7-8 is a safe period. Get yourself a timer.

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post #9 of 28 (permalink) Old 12-02-2011, 05:50 PM
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you can always split you photo period up. 3 hours int he morning and 5 at night. that is what i do. so the tanks are lit when i am home...


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post #10 of 28 (permalink) Old 12-02-2011, 07:32 PM
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you can always split you photo period up. 3 hours int he morning and 5 at night. that is what i do. so the tanks are lit when i am home...
Thats what I do except

2hr in the morning
2hr is the afternoon
3hr at night.

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post #11 of 28 (permalink) Old 12-02-2011, 07:39 PM Thread Starter
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So since I am home all the time I will have to get used to some dark time in the middle of the day...what is to long...so I can do something like 2x2x4

can i switch that now??do i need to transition to that??

Last edited by denboka; 12-02-2011 at 07:41 PM. Reason: add question
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post #12 of 28 (permalink) Old 12-02-2011, 07:40 PM
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8 is to long (non Co2 with HO) to long is when you start seeing algae.

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post #13 of 28 (permalink) Old 12-02-2011, 07:41 PM
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Quote:
12hrs is to long, 7-8 is a safe period. Get yourself a timer.
I disagree. A normal light cycle is 10 to 12 hours a day, and splitting the light cycle accomplished nothing. All it does is interrupt the growth cycle and photosynthesis. The plants begin their growth cycle, stop, and then start over again never completing a cycle.

Most of the plants we grow come from a tropical region of the world. 10 to 12 hours is a short cycle, 14 hours is a long cycle. If the plants come from the equator, then 14 hours would be a normal cycle for the plants. How many hours of light is there during the peak summer months from sunrise to sunset in North america? How about South America?

The key is balance between light, C02 and nutrients, not the length of the light cycle. Plants need a continuous light cycle. I run mine 10 am to 10pm.

With some plants a short light cycle of eight hours or less will trigger dormancy in the plants. Particularly plants with a bulb or tuber. Many plants hibernate during the winter which has shorter light periods- Aponogetons, Barclaya, Nymphaea....

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post #14 of 28 (permalink) Old 12-02-2011, 07:52 PM
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The key is balance between light, C02 and nutrients, not the length of the light cycle. Plants need a continuous light cycle. I run mine 10 am to 10pm.
And thats where the balance ends here. He is not using Co2.

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post #15 of 28 (permalink) Old 12-02-2011, 08:15 PM
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but shortening the light cycle will not create more C02. In a low tech tank you balance by having low light intensity, a nutrient rich substrate, and a substrate that encourages some C02 production by bacteria and decomposition of organics in the substrate, not by lowering the light duration. And you still have algae anyway. If plants can grow, so can algae.

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