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I think that sometimes a little bit of algae will grow on the leaves of the plants...I have two ottos, and the back wall of my tank is covered with algae, but they seem to spend equal time sucking on the wall and on the plants. They both seem to be doing fine.
Also, a question about your algae farm/rock: was it completely covered with algae when you took it out of your farm, or did it just have a few hints of green? I have had a rock in a dish of water for several weeks now, and it still doesn't have that much algae on it...
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