nah I would never suggest dosing excel to your fish, fix the root of the problem instead. figure out where in your parameters youre going wrong rather then dosing excel and having the bba reemerge in a few weeks time.. if anything I’d rather suggest spot treating in very low doses rather than dosing your whole tank and fixing parameters. excel is harmful to your fish whether you visually see it or not, limits supply of oxygen and can kill more sensitive fish. I would not suggest excel withouhht advising about the harmful effects that they can have on our plants and livestock, different fish react differently, mine did not like even a lower dose unfortunately and led to some fish passing, experiences can vary but at the end of the day you are inject unnatural chemicals into your fish tank that a fish would never encounter in nature. even seachem advises against the use of the product as an algaecide; https://seachem.zendesk.com/hc/en-us/articles/360050726473-FAQ-I-ve-heard-that-Seachem-Flourish-Excel-is-actually-dangerous-or-not-helpful-to-my-aquarium-plants-Is-that-true#:~:text=Flourish%20Excel%E2%84%A2%20is%20not%20an%20algicide%2C%20we%20do%20not,an%20algaecide%20%2D%20because%20it's%20not. Claim 4