Some barbs tend to be a bit snippy towards each other, although cherry barbs are pretty peaceful. A bigger tank would give them more space to swim and let anybody picked on get away. A gold algae eater gets several inches long - one google article said 8". They do get a bit aggressive towards other fish. I don't know what size tank you have, but if lightly stocked and you maintain good water quality, you should be ok. You may eventually want to get the algae eater a bigger home, but you have time.
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