Skinny stems... What to do? - The Planted Tank Forum
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post #1 of 4 (permalink) Old 08-07-2008, 06:38 PM Thread Starter
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Skinny stems... What to do?

Plants have been getting leggier and leggier in our tank.

At first it wasn't noticable, we had excellent growth, the hygro was good and dense, so was the rotalla, and now there's like a inch between the leaves in the Hygro. It's gotten really lanky too, smaller leaves. What's the cause here? they grow super fast, but seem to be getting skinnier all the time.

Here is the info on this tank:
75 gallons, densly planted
3x 65W of T5H0
DIY C02 changed once every 3 weeks or so (it's my boyfriends job, but he only does it when I get cranky about it)
4 capfulls of Big Als Aquarium fertilizer 2 capfuls of Flourish Excel
1 capful of Flourish Iron

All dosed 2 times a week (sometimes 3)
Root tabs under the crypts and swords.

We don't have this issue with the same plants (clippings from the plants in the 75) in our ten gallon or 5.5. which are both low light, low tech tanks. Is it a nutrient issue? Our Nitrates are really low (despite having a lot of fish in there). What should I do to promote thicker stems and bigger leaves?
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post #2 of 4 (permalink) Old 08-08-2008, 12:58 AM
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Increase CO2 and phosphates. PO4 grows thick, strong, and healthy stems (leaves too). You may also need to increase nitrogen levels after increasing CO2 and PO4.
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post #3 of 4 (permalink) Old 08-08-2008, 03:55 AM
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generally speaking, long internodal distances with plants is a lighting problem. it sounds like you have plenty of light, but how high above the water is it and what kind of refletors do you have.

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post #4 of 4 (permalink) Old 08-08-2008, 01:20 PM Thread Starter
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Thanks for the help.

The lights are an inch above the water and they've got excellent reflectors.

I think it may be a nutrient deficiency. Maybe CO2.

The plants in the big tank grow WAY faster than the plants in the other lower light, no c02 tanks. I don't have this problem in the smaller ones, so that leads me to beleive, that either I have too much light (not likely) or I'm not fertilizing enough for the light that I have.

The other (non-stem) plants in the large tank are growing great... Except the large sword does get some yellowing of the older leaves.
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