I did notice some bleaching in my tank awhile ago while using NP Biopellets, but I believe that was due to my feeding levels. BP can and will strip your tank pretty clean. I now feed heavier, I don't rinse my food and I dose a few zeo products (some AA,s) and things are starting looking good again.
It also might be worth mentioning I transitioned from NP Pellets to the Vertex pellets.
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Robb
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