Coursair
Aquarium Advice Addict
Actually, bristlenose plecos and rubber lip plecos are usually 4-5 inches with the biggest ones being 6", so I think that a 29 gallon is big enough for one, just again, make sure that you don't get the common or any other type of pleco, as they do grow over a foot long
IME Since the tank is only about 30"L x 12" W
I still say that's small for a fish that can grow 6".
A Pitbull Pleco or Otos would be a better choice for a sucker mouth Catfish. But not my tank, not my choice. JMHO