The vast majority of people don’t know this, but there are at least like 4 SAE species. 3 of the 4 look very very similar and fish stores most often don’t know which ones they have. Only one of the 3 which look super similar is a true SAE (“crossocheilus langei”). The easiest way to identify them is that they have a small black line on their underside like in this old photo of mine. 
They will eat BBA into adulthood and never pester plants (as long as they’re fed well). Then there’s the fourth species which also eats BBA into adulthood and won’t pester plants, but is clearly identifiable—the reticulated Siamese algae eater. The other species that look almost identical to the true SAE (crossocheilus altrilimes being the most common) only eat BBA when they’re young and enjoy snacking on plants like Downoi, AR, and fine needle plants like Walichii, which I experienced first hand with my first SAEs which turned out to be altrilimes. I rehomed them and got the true “langei” and never had any issues with them snacking on any of those same plants. See here for more info in the notes section - Crossocheilus langei – Siamese Algae Eater (Crossocheilos langei, SAE) — Seriously Fish.

They will eat BBA into adulthood and never pester plants (as long as they’re fed well). Then there’s the fourth species which also eats BBA into adulthood and won’t pester plants, but is clearly identifiable—the reticulated Siamese algae eater. The other species that look almost identical to the true SAE (crossocheilus altrilimes being the most common) only eat BBA when they’re young and enjoy snacking on plants like Downoi, AR, and fine needle plants like Walichii, which I experienced first hand with my first SAEs which turned out to be altrilimes. I rehomed them and got the true “langei” and never had any issues with them snacking on any of those same plants. See here for more info in the notes section - Crossocheilus langei – Siamese Algae Eater (Crossocheilos langei, SAE) — Seriously Fish.
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