Brittle plants - The Planted Tank Forum
 
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post #1 of 9 (permalink) Old 03-21-2004, 10:15 PM Thread Starter
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Anyone know what causes plants to be brittle? It seems that my fish nibbling at them to get the algae off is enough to break them. They didn't used to be so brittle. Now they are cluttering my tank and stopping up my intake for my canister filter.

I figure that it is a nutrient or CO2 shortage. I fertilize once a week with Flourish Comprehensive Plant Supplement with the recommended doses for my tank.

I've read that the higher the light in your tank that the plants may use up all of the available CO2. I've also read that plants will use up one or more of the nutrients before they do another under higher light, and it will stop growing until there is more of that nutrient replaced. I do about a 10% water change each week. I've read that might need to do as much as a 25% every 2 weeks.

Some info:

100 Gallon Tank (60x24x18)
2 Jalli 110W PCF
4 Hagen Life-Glo 20W

8 degrees of Carbonate Hardness
Ammonia is effectively 0
Nitrite is effectively 0
pH is about 7.5
(those are the only tests that I have on hand)

Big Ole Tank of Fish
29g Ehiem 250
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post #2 of 9 (permalink) Old 03-22-2004, 12:23 AM
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Which plants are brittle for you? Some are just fragile.

Sean

Aquascape? I'm a crypt farmer.

It's a fine line between fishing and standing on the shore looking like an idiot.

That IS an aquascape, it's titled "The Vacant Lot".
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post #3 of 9 (permalink) Old 03-22-2004, 03:11 AM Thread Starter
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The Anacharis, Cabomba, Bacopa, and the Water Sprites are all doing it.

The Anacharis and the Cabomba's grew really well for about month. Several inches a day at least. The Bacopa and Water Sprites never grew very well.

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post #4 of 9 (permalink) Old 03-22-2004, 04:05 AM
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I would say that is macro nutrient deficiency under high light. First the grow well, than - bam - stuck at zero.

First, buy a decent NO3 test, like Red Sea or Seachem or something better. If levels are at zero, need to get them up to 5-10 ppm.

Those lights, are they 2x 110W or 1x 110W? In either case, injecting CO2 would help to improve plant health.

Next, potassium and phosphate. Get a PO4 test and dose it to 0.5 to 1 ppm if necessary. Dose some potassium to about 10 ppm.


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post #5 of 9 (permalink) Old 03-22-2004, 01:03 PM
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Definitely some kind of deficiency. If they're that brittle that the fish nibbling on them is enough to break them, I sort of suspect iron chlorosis. BigOle, what sort of trace elements do you dose?

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post #6 of 9 (permalink) Old 03-22-2004, 01:59 PM Thread Starter
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What ever is in the SeaChem Flourish. http://www.seachem.com/products/prod.../Flourish.html
I thought it was supposed to have everything that I needed in it

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post #7 of 9 (permalink) Old 03-22-2004, 02:48 PM
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Quote:
Originally Posted by bigoletankoffish
What ever is in the SeaChem Flourish. http://www.seachem.com/products/prod.../Flourish.html
I thought it was supposed to have everything that I needed in it
Nope, Flourish is equivalent to a 'plant vitamin'. Macro-nutrients (N P K) and CO2 is the food.

Ted


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post #8 of 9 (permalink) Old 04-09-2004, 05:06 PM Thread Starter
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Well, after about 2 1/2 weeks of dosing the plants with the appropriate fertilizers things seem to have improved. My plants aren't breaking off anymore, and I'm getting some good growth.

Thanks for the help.

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post #9 of 9 (permalink) Old 04-09-2004, 06:36 PM
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right on! Always nice to see someone utilize the forum, take that knowledge, and fix their problem.

I used to use flourish as a trace dose, but now I've been turned on to Plantex with Boron. Only been dosing for a week, but it's 100 times more cost effective. you might look into that one if you don't already have it.
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