Like most things in life, you only hear the bad stories. No one is interested in writing or reading happy stuff.
I think pellets have their place, but they can also cause issues if not used correctly, just like any carbon dosing. The trouble with pellets is the ambiguity of how much to use, how fast to tumble, how to introduce them, etc. I believe the biggest problems come from non-circulating reactors. They seem to flood the water column with carbon and bacteria as the output is more than the skimmer can handle. I run about 100 GPH of processed water in to my 2000 GPH skimmer pump. This zero bypass method has made a big difference.
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