I have heard before that the holes will repair but i don't think this is the case with my pleco.
As for the tank size and fish, i have a 55 gallon tank with 11 other fish. I have 7 black neon tetras, 1 red wag platy, 1 albino Cory catfish, 1 upside down cat fish and 1 dwarf oscar.
Here is a picture of the pleco.