At your stage you may well not have any algae yet, but you will probably at least get some somewhere along the line. For freshwater, there are many species of algae eaters that do just that-- eat algae. There are many types, some don't do a very good job and some are excellent. Geez, there are so many that come to mind, I don't really have time to list them.
In addition to algae eating fish, others that fall into the "clean-up crew" category, include corydorus catfish, various fw
shrimps, and also snails.
Hopefuuly we help you out here a good bit, but in this case a good fw
fish encyclopedia would help you out a lot. A personal aquarium library is key in this hobby. Have you purchased any books yet?