Mine cleared up the whole 160L tank of BBA in just 48 hours when I first got them (6 of them), they were about 1.5 inch long. Now, they're all over 3 inches long, they do eat ANYTHING I put into the tank, but they also work on algae all day long (except when I am feeding, of course). Even some time I pull BBA out of places they can't get to, such as corner or inlet of filter, and if I just let go of the BBA, my SAEs will eat it as soon as they see the BBA floating.
One more thing, SAE is schooling fish, so they are better kept in group of 4 or more.
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