02-02-2012, 12:29 AM
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I had similar problem with Pennywort until I reduced the lighting period from ten hours to eight hours.
Took a couple months but the algae went away.
I also chose plant's that do well in low light rather than those that need more light.
I use T8 bulbs rather than T5 and this seems to help also.
I also have light's on cheap eight dollar timer so that they come on and go off each day at same time.
My tank's presently are all low tech,low light,with weekly addition of fertilizer.
Trying to increase light intensity or duration in planted tank's without benefit of CO2 injection or Excel (liquid carbon source), often result's in plant's not performing well, for with increase in lighting,,,there is also the need for more CO2 and Fertilizer.
When this type of inbalance occurs ,algae is quick to take advantage, for it needs much less of everything compared to plant's.
Some plant species are best suited I believe,,for CO2 enriched tanks and often do poorly, or grow much more slowly if at all, in low to moderate light with no CO2 enhancement.
Light is the driving force in planted aquariums. It dictates everything.