If its a Chinese Algae Eater then it will become increasingly agressive as it matures towards other fish- do not confuse this fish with Flying Fox, False Flying fox, Siamese Algae Eater and Oto algae eating fish.
This is what CAE's (chinese algae eaters) look like;
http://badmanstropicalfish.com/profiles/profile47.html
They vary quite a bit in colouring and patterning, there is also an attractive golden variety too.
Because these algae eating fish often become very territorial and agressive as they mature, few people choose to keep these fish in the long term as they do not make good community fish in general.