09-05-2011, 12:02 PM
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Several factors affect things, but to control algae you will likely need to reduce the duration. Two T8 tubes is fine over a 55g, but algae will try to take over.
And this is where the Flourish Comp enters. Once or twice weekly depends upon other nutrient sources. The hardness of the tap water (calcium and magnesium basically, but other minerals too), the fish stocking (type of species, numbers), how much food they are fed, and the plant species and number. All this affects the system. I would start with once a week Flourish Comp and see how the plants respond.
Algae increasing is a sign of too much light and-or insufficient nutrients to balance. Having doubled the light intensity, you should expect some algae issues until the new balance settles. I would myself reduce the light to no more than 10 hours. Presently, I have my tanks lit for 8 in order to control algae, and these are larger tanks with two T8 tubes. It is the light only that causes algae, not the nutrients. Provided the plants have adequate nutrients available, they will use the light; only when the nutrients are missing will algae use the light because the plants no longer can photosynthesize to the max.