Erik, myself and others discuss the use of it.

We tried a few things.

Jeff Senske and I talked about it's use as well as purigen and other like products.
Amano uses it.

I do not think it has adverse impacts on planted tanks, rather I think it's actually helpful.

So are water changes, but in cases where you cannot do as many as you'd like or hazy water issues, this may help.

Unless they can show that it impacts plant negatively, which is in serious doubt given myself, Amano, Jeff Senske and others that are good observationalist, the burden of proof to show cause in on them.

I see no relationship with a well run tank that would serve as a good control, they do. the question is, can they reproduce the tank as a control to begin with to test to see?

Most often, no.

Regards,
Tom Barr