Convict Cichlid Question

Hey there,
I have a ten gallon tank with two baby convicts in it. Now, these two
fish are black convicts and are not more than an inch long. I have had
no problems except having to relocate my neon tetras and other than that
they seem to be getting along fine. However, more recently I have
noticed that one of them seems to be rather bloated, if you will. The
other is fine and swimming around happily being a baby cichlid, but the
bloated one seems somewhat listless at times and not as active as he
used to be. I haven't really seen him eat that much so I don't think
he's over eating either. Any suggestions?

10 gal
temp: 78deg
pH - 7.0
Ammonia - 0.0
Nitrite - .3


Thanks,
Matt