Hey...the recommended size tank for them is about 30 gallons. But they only grow to 4" if that. I would say that your okay putting it in your 20 gallon. But remember that they need plenty of hiding spots and they like plants in there environment...But overall it would be a awesome feature to your tank. Well you probably know about pleco's so I didnt really need to say they need hiding spots and plants lol.
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