Fish And Plants

hi i have 6 moscow blue guppys, 6 gold tuxedo plays and 5 neon tetras, apart from the tetras the others seem to enjoy having a suck of the algae on just one variety of plant that was overtaken by algae during the fishless cycle, just wondering whether this was normal for the fish to be cleaning up the algae, i was thinking about getting some algae eaters but the fish seem to be doing it all for me!!