I would venture to guess, at least 90% of MFK members have kept, or are keeping Pleco's.
Got my first common type n the 1960s. Outgrew my tank pretty quickly, commons usually reach over a foot long.
Had a couple more in between, but now choose Ansistrus species. because they stay smaller
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My current one is Ancistrus chagrasi from Panama, and is kept in my Panamanian biotope tank (below)
caught about 3 years ago, started out about 4", when 1st caught in a river near San Martin
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Is now about 8", still eats algae, but also eats fish flesh
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Photo below was taken @ a week ago in a 125 gal tank
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As mentioned they should never be kept with Discus, or other slow flat fish like severums, and other substrate huggers, as they will eat the slime coat off their sides at night.
They will also eat fish eggs, and non-free swimming fry.
And as someone else said, often produce more waste than the algae they clean up, produced fertilizer for more algae, especially as adults when they need more protein.
Locals here in Panama eat them, and call them Chopa Piedras (stone suckers) they are said to taste like lobster