I don't know anything about this product, but "polymer coated" is where I stop. You might be left with odd colored shells of granules that don't dissolve similar to Osmocote. Then you're stuck with mismatched substrate looking ugly. I use bits of fresh aquasoil or APT Jazz. I bought some large capsules and filled them with APT Feast to shove under plants I want to give a boost. It only took a few minutes to make a bunch that will last me a long time, and the ammonia isn't released into the larger tank possibly upsetting stability.