Can anyone suggest me a small algae eater?

Okay so i'm going to receive 30-55 gallon tank from my cousin (she's not sure how big) and depending on how big it is i'm probably gonna have 6 serpae tetra, 3 mickey mouse platies, 3 sunset platies, and 3 blue platies but so there isn't much aculated waste or so that algae growth doesn't invade the real plants on my tank i'm want to buy an algae eater that is small and that doesn't have any problems with the fish i have