You may be running to many bio-pellets, I have found that they work well on tanks with a nutrient problem. I run them on my softie tank with great results, but took them off my sps tank as they were causing stn and rtn of my sps. This all stoped with days of removing the pellets from that system.
I also think less is more when dealing with the bio-pellets. I run half of what they recomend on my tank, The cheato is still growing(with a little die off when adding new pellets), this just means that I add more on a more frequent basis.
You could try feeding the pellets as you would with zeolites. I have found that the pellets need lots of food to work well. Just my two cents, hope this helps.
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