Well, they worked for me, but in my case I had nitrates as high at 100 ppm. Down to less than 20 now. Really cleaned up my tank, too. No algae or cyano. I just have LPS and softies, and they all seemed to like it.
I have heard of corals getting bleached after bio pellets. Perhaps they need a trace amount of nitrates/phosphates, and the bio pellets depleted them too much.
Also, more recently, some people have reported coral bleaching and dying after use of Kent carbon.
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