I have some in my neo tanks. You're looking at the right stuff, it does come from the bird section of the store. I put in about a 1.5x1.5 inch square or so. I see them munching on it from time to time. I haven't noticed any param changes - it certainly hasn't hurt anything. I'd start with small pieces and observe a while. I wouldn't expect immediate changes either. It's a slow, gradual effect.
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