Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
Do you mean Pleco? At 8" this fish is WAY too big for a 29 gallon tank. Return it to the store.
A 29 gallon tank is not a large tank. I would stick with fish that do not get much over about 2". Maybe 3" if they are calm or sedentary fish.
Pearl Gourami is a good choice. Large, but slow moving, mostly just hang around near the top of the tank.
Most Anabantoids (Gouramis, Bettas, Paradise Fish) are territorial, and can get aggressive toward related species. Pearls are usually among the more peaceful of Anabantoids, but still, I think I would just keep one in a 29 gallon tank. Not a lot of room for a lower ranking fish to get out of the way of an attack.