03-28-2011, 07:26 PM
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I found this on another planted aquarium forum. The person sounds like they had the same thing as what I have (only I have it on the rocks and glass as well) - they figure it's lime scale below is a response that they received:
"This is called biogenic decalcification. Certain plants (like Egeria, Najas, Vallisneria, and Ceratophyllum) are capable of utilizing the bicarbonate ion as a carbon source. They take in bicarbonate, HCO3-, keep the CO2, and leave behind OH-. In strong light, enough alkalinity is created at the leaf surface to precipitate calcium carbonate, CaCO3. This process can also raise the pH up to potentially dangerous levels."
Has anyone heard of this? What do I do? I'm going to check my pH tomorrow (I just did a 50% water change yesterday).
SinCrisis: the tank had some limescale around the top but I try to clean it off as best I can every week when I change the water. I don't think it's falling from there - I don't see much in the water itself just on everything... I'll try the polishing pad though, just in case. I also thought I might get some peat pellets to put in my filter and see if I can soften the water somewhat.