Clown Loach from Hell :(

Hi Group,

The tanks are going well and the Clown Loaches (with lots and lots of
hiding places) are getting big (few inches long now), their out and
about alot! I'm really lovin it, the cats are mezmorized too. Thanks
for the past help to get me here.

There is one Loach, however, who seems to be just chasing every one all
the time. Once I even saw him having a "mouth toug of war" with another
one. He really seems to upset the apple cart... Is this a problem?
Should I give him back to the store where he may end up with more
suited (wishful thinking) tank mates ? He's also always had a sort of
"washed out" color not looking so nice but that has nothing to do with
thinking about what (if anything) to do with him... I'm not even sure
if it's a problem but it seems stressful for the community with a
serial mugger on the loose.

It's a 55 gal with 6 Clown Loaches and one Botia Dario, all still small
(under 2" or so). I'm tempted to add 2-3 more clowns but like to keep
my tanks under populated and over filtered with a AQ 110 and 50.
Should/can I add a few more safely? I really love these silly litte
critters!!

Thanks all, best as always, Karl.