I go 3-4 weeks. I do not redose and do not make water changes. Only top-off. I have used it in FOWLR before with great results. No change in dose. It will kill all algae though.
I have not dosed it with copper. I personally do not like copper - there is no doubt that it works well when done correctly though.
In addition to killing the feeding parasites, Anti-malarials may have an anti-inflammatory effect and this could be beneficial to reduce an aggressive host response against the parasite thereby reducing edema of the gills and allowing better oxygenation. - Just a theory, but may be the reason why your fish have "perked up".
I have not dosed it with copper. I personally do not like copper - there is no doubt that it works well when done correctly though.
In addition to killing the feeding parasites, Anti-malarials may have an anti-inflammatory effect and this could be beneficial to reduce an aggressive host response against the parasite thereby reducing edema of the gills and allowing better oxygenation. - Just a theory, but may be the reason why your fish have "perked up".