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If you overdose, yes. If you dose properly, generally not. If you have excess algae, the very first thing you need to do is reduce the light duration and/or intensity, depending on the type of algae you are "growing".
 

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Discussion Starter #3
depending on the type of algae you are "growing".
Brown stuff. Folks in this forum diagnosed it as a diatom.

Link to My Earlier Post

Started shortly after my tank cycled. I have only one live plant in the tank right now, a banana plant. I was planning to add other easy-going plants and fertilize with Flourish. Wondering if I should hold off until I'm free of diatoms.

I'm not in much of a hurry, as the banana plant seems to be doing okay. I also wonder if my lighting is too intense - even though it's only a 17W single-bulb fluorescent - because the new leaves on the banana plant are developing reddish coloration.

The lamp is on for 10 hours each day, and there are 10 to 11 hours of complete darkness.

Thoughts?
 

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If the tank hasn't been set up too long, then don't do anything - the diatoms will likely go away on their own. I have occasional diatom "outbreaks" if I do a major re-scape and stir up too much organic matter and plant fertilizer tabs.
 
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Discussion Starter #6
Thanks all. I'm gonna give it some time before I add any more mouths to feed. But I do want to install some additional plants.
 
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