Green Hair Algae Problem - The Planted Tank Forum
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post #1 of 2 (permalink) Old 09-19-2002, 01:14 AM Thread Starter
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I upgraded the lighting on my 125 to power compact and since then I have had a very bad hair algae problem. I have black mollies in the tank as I had heard they would eat it but it grows so fast that it takes over tank. The tank has a wet/dry on it with a magnum 350 cannister running. I have a 3 inch layer of gravel over top a 2 inch layer of Flourite. I did not have hair algae when I was using flourcent tubes. Any Ideas? By the way, I don't use CO2.
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post #2 of 2 (permalink) Old 09-19-2002, 03:56 AM
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Depending on how old your fluorescent tubes were, and how efficient your new PC's, reflector's and ballasts are, you may very well have doubled the amount of light from your previous...even if you didn't increase the number of watts!

Upgrading your lights has upset the balance of your tank. To balance a planted tank the best approach is to use Liebig's Law of Minimums to your advantage. Leibig's law states, in simple terms, that there is always a limiting nutrient/element in plant growth/yield.

For planted tanks, we set the lighting, then add CO2 so that it's never the limiting nutrient, then is just a matter of providing the plants the proper amount of macro and micro nutrients. Plants are by dry weight over 40% then makes logical sense to provide carbon (CO2) in abundance. Remember that if plants are healthy and growing you'll not have problems with algae. Deny the plants what they need, or provide a nutrient (other than carbon) or lighting in excess of their needs and algae will flourish.

Admittedly, the principles are simple, but the implementation is difficult. IMO, it will be very difficult for you to control algae in your situation without supplemental CO2.

Steve H.
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