Slow plant growth - The Planted Tank Forum
 
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post #1 of 3 (permalink) Old 08-04-2012, 10:21 PM Thread Starter
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Slow plant growth

I have 20 different plants in my tank and they all grow so slow. Some I trimmed and it's taking forever for the plants to grow and the ones that do grow very slowly have thinner leafs. I have flourite sand.

I have Co2 and 1bp2s. . Have Seachem root tabs, frourish ferts, iron. Do water changes twice a week.
I have 12g Biocube. The stock light is 10000k. Should I add another 10000k or switch those out for 2 6700k?
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post #2 of 3 (permalink) Old 08-05-2012, 12:24 AM
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'k' is just what the light looks like to our eyes. It is a blend of colors, and often they are not the same colors that plants use. I'll bet you have lower light than you think you have.

Look into the better bulbs that are designed for plants. Look for the label that is like a little graph with several lines, probably filled in.
The peaks need to be in the areas where plants use the most. There is one peak in the red area, and one in the blue area.
Humans do not see the red and blue so well, so these colors are often missing or not very strong in bulbs for home or office.
Humans see yellows and greens best, but plants do not use these very much.

So...

A light intended for humans is not usually the best for plants, and certainly getting several of the same mistake will not fix the issue.

If all you have to go by is the name of the bulb, and a k number then get a mix of bulbs such as Daylight, Cool White, or Plant and Aquarium. I mix 2 or more of these on my tanks and it is still not enough. The tanks are also near windows, and that helps a lot. any k value in the 6,000 will probably be OK, but get a mix. 10,000k is usually too far into the blue for plants.
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post #3 of 3 (permalink) Old 08-05-2012, 12:31 AM
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My first guess is that the stock light is not adequate for what you want.
If you want faster plant growth you need more light and of the right kind.

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