Hello,

I have a similar problem with my Bubble Eyes. I'm keeping two SMALL
bubble eyes in a ten gallon tank with a sponge filter. A calico and a
gold Chinese variety. The calico keeps chasing the goldie around and
nipping fins/bubbles. All water parameters are fine. No measurable
ammonia, nitrites, nitrates under 5 ppm. I put in a tank divider as a
temporary fix. Maybe it will reform him into being nicer.

Mike.