The damage done to acrylic is minimal. Just plain scratches or none at all depending on the fish you get. If the acrylic were to suffer deep scratches, it would have to be the potato grinding plecos that are extraordinarily large, doing it. See Oddball's pleco pics in a sticky in Plecos forum.
I agree with Joworth. Using a fish to scavenge over wastes is a bad excuse to get a particular fish IMO. Nothing can replace gravel vacuuming and water changes. If you want algae eaters, nerite snails, otos, bristlenose plecos, some species of whiptail plecos and clown plecos work but they specialize in a certain kind of algae, not everything. What is the size of your tank and what fish are in it?
The damage done to acrylic is minimal. Just plain scratches or none at all depending on the fish you get. If the acrylic were to suffer deep scratches, it would have to be the potato grinding plecos that are extraordinarily large, doing it. See Oddball's pleco pics in a sticky in Plecos forum.
I agree with Joworth. Using a fish to scavenge over wastes is a bad excuse to get a particular fish IMO. Nothing can replace gravel vacuuming and water changes. If you want algae eaters, nerite snails, otos, bristlenose plecos, some species of whiptail plecos and clown plecos work but they specialize in a certain kind of algae, not everything. What is the size of your tank and what fish are in it?