I'm a new member here and came upon the site through an interest in floating wetlands, horticulture, and water quality in general. I've a lot to learn about growin' fish.
Being unfamiliar with commercial/chemical products, my first thought regarding your post was barley straw (logs.) I've heard just a bit about them. I searched this site for references to it and found several. Some refer it as "preventative" (rather than curative?) I don't have personal experience with barley straw, but it seems like a pretty low-stakes, and almost certainly harmless, approach.
A quick google search found this article that explains the theory on the process/chemistry...
(barley straw article) I have no idea who's a good supplier -- this was just one of the first articles I found. Sounds like aeration is still important to proper function of the biology that consumes nutrients and breaks down the straw.
For what its worth...(which may or may not be much.) I'd be curious to know! Good luck.
