if its like most other plecos, dont count on him to eat too much algae, chances are he'll eat cut up cucumbers and algae waffers though, as well as left over flake food.
he wont hurt other fish, but sometime adult common plecos will fight.
i dunno if this is a dwarf pleco. but commons get 18"+ 37 may not be enough
"Atrocities are not less atrocities when they occur in laboratories and are called medical research."
George Bernard Shaw