08-08-2011, 05:00 PM
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not really sure what the nutritional value of the tank algae is. mine do the same thing. i'm sure they are getting what they need from all you are feeding.
On an odd note, I was feeding my pleco some zucchini with some peach stuffed in the middle and the peach got loose and was floating around the tank, getting blown around by my filter output. My angels chased that thing and pecked at it for an hour before I finally took it out. It was like a game for them.