Will High concentrations of CO2 cause damage to plants? - The Planted Tank Forum
 
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post #1 of 4 (permalink) Old 02-06-2004, 06:58 AM Thread Starter
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HI all, well some of you might know that recently I discovered that my PH controller was actually set around 2.4 above what it actually was. The result being that my PH actually was around 4.7 with a KH of 3.0

This gave me a CO2 content around 87-90ppm. Wonder that my discus did not die on me.

Anyway I have recalibrated the controller and now my CO2 usage has gone down markedly. In fact I will be surprised if I use a 2kg tank in two months.

My problem is, how do I now control the algae and my java fern dying off. The algae is out of control, and I have even reduced my ferts (dupla 24 drops) down to 11 drops a day. My nitrate level is at 5-10ppm. Phosphates need to be checked. The algae is that browny green stuff with some spots of green algae.

As for the Java fern dying off, is this caused from the high CO2?

Anyway any advice would help to get my tank back to its former glory. Maybe I need to add a heep of stem plants to help soak up the excess nutrients.

Paul
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post #2 of 4 (permalink) Old 02-06-2004, 02:15 PM
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How much and how often do you change your water?
some good 50% water changes at least weekly will set things straight, then you can build up to the levels needed with your nutrients, C02 etc.
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post #3 of 4 (permalink) Old 02-06-2004, 03:35 PM
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Do you know for how long the tank had this low pH? Now that it is corrected, I would expect the Javaferns to recover... but it is possible that the low pH damaged it.

Stem plants might be a good idea. The more plants, the easier it is to get into balance and rid of algae. Later on, you can remove/reduce the fast growing plants.

What exactly is browny green stuff :lol: is it thick and fuzzy or a thin layer covering plants/substrate/glass? Any algae eaters in there?


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post #4 of 4 (permalink) Old 02-07-2004, 10:03 PM Thread Starter
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I do 50% water changes every week as it is, but have to feed my discus frozen food, which as we know is high is phosphates.

The algae is a thin covering over the leaves, so it is not beard algae and yes I have eight saimensis in the tank at present who are busy trying to get rid of the problem.

As for the Ph problem I think that it was probably like that for over five months, thats when I really started to use too much CO2.

Have now put in polysperma of two varieties, Rotala wallichi and Macaranda in tank. I hope things should now settle down.
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