there is a forum somewhere on algae scrubbers where the creators and sellers of algae scrubbers swear up and down that they work great for freshwater tanks!
Then there are all the people with freshwater tanks that don't seem to see the results promised.
I'm guessing part of the reason is the temp of the lighting used in planted tanks vs non-planted tanks
At least that was what I got out of the forum, for saltwater sounds like it works, but saltwater tanks are designed different by necessity.
Yeah, I bet most of the folks sellin 'em are saying they do some stuff they likely don't. They can wipe out nitrate which is why they work in salt. I want to know how they behave in fresh. I don't get your reference to temps, by the way.