Can I put a placo. contained by a cistern next to a mannish betta?

it is a 1 gallon tank, male betta in at hand by himself.

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no

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No. A 1 gallon is essentially too small for a male Betta. Even the smallest of the Plecos such as the Pitbull and Bristlenose need a MINIMUM of a fully filtered, cycled and heated 15-20 US gallon container.

The often mistakenly sold "common" and "sailfin" plecos grow anything from 12"-24" and need at least 75-100 gallons.

No catfish can be kept within a tiny 1 gallon.

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the male beta will verbs the placo. they are beasts. 99.9% of the time.

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Common Pleco
"Many will get severely large with the common multiplicity getting to be almost 18 inches (46 cm) and will outgrow most aquariums under 55 gallons."

Short answer: No.

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Answers:    I Would think you could get a small pleco. But some people would vote no

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pleco will be fine in there beside your fish
like the girl said first it might outgrow your tank
unless your planning on up sizing your tank

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That tank is too small for a pleco. The betta is perfectly fine all by himself.

You also hold to be careful, I've owned plenty of larger plecos that HATED bettas and would kill them.

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