There are a lot of type of peaceful, pretty plecos that stay much smaller than your common pleco. He's probably not done growing yet either. There are as was said various types of bristlenose plecos, clown plecos, gold nugget plecos, some nice peckoltia species. Do some research on the types of fish you'd like to keep in addition to the pleco and look for environment compatibility to be able to put your new stock list together.