It's the Chinese algae eater. The bigger they get, the meaner. They have been known to wipe out entire tanks. It's sad how commonly they are sold... Return the CAE
or just get rid of it somehow.
Welcome to the forum though
Otocinclus are great little algae eaters. If you are having algae problems though it is usually related to a few reasons.
1. Over feeding
2. Extended photoperiod
3. Overdose of fertilizers(if used)
4. Lack of water changes.
How long do you keep your lights on every day? This is usually the common reason for brown algae and sometimes green.
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