Chinese algae eaters don't normally get aggressive until they reach a certain age/size. That means yours is growing up. At that point some prefer other fish's slime coat over algae and that's when the problems start. That's why I got dwarf puffers for my aggressive, too small to latch onto and poisonous to boot. Even CAEs seem to know this and he will not bother my puffers. I feed my aggressive one shrimp pellets and a piece of fresh shrimp from my meat department every so often. That seems to keep him happy enough. My non-aggressive one will not touch the fresh shrimp, while my aggressive one gets totally wild and tears it apart.
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