I hope I am remembering correctly-- but ottos are south american fish and siamese algae eaters are asian.
Ottos are shaped more like a polywog and CAE's are longfish with sucking mouths.
Ottos also have sucking mouths but they stay small. They are very skittish fish and play at night.
i would not keep any other algae eaters with the ottos unless you have a huge amount og algae. I have one in a 15 gal heavily planted tank and it is always looking for food. there is hardly any algae there.
Also it won't eat algae tabs.
A nice fish is the siamese algae eater. They get bossy as they age but they continually nibble algae too.Do not confuse them with flying foxes!
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