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i'm not sure about the smallest...but bristlenose plecs stay pretty small. i know some who have them in 10 gallons.
 

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Zebra Plecos are a dwarf species and normally top off at around 3 inches. That's the smallest I know, althought there could be smaller ones.

As for tank size, people probably keep them in 10 or 20 gallon tanks, but I would suggest at least a 30 gallon tank for all kinds of small plecos under 5" to be happy and healthy.
 
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