I recently added two smaller clown loaches to a community tank with about 60
fish, including a larger (3") clown loach. For the first couple days the
old fella varied between disinterested and aggressive. But they have
settled down now, and all are happy together, tho' the big guy likes the
other two to know who is boss. Interestingly, the large one has now started
making the clicking noises I have read about, but not previously heard. He
definately didn't do it before the new ones were added to the tank. I
suppose he is just letting the others know he is the top dog. Fish are
fascinating.

I would also like the whole world to know that for the first time I actually
kept the two little ones in a quarantine tank for the whole three weeks
which is commonly recommended. It was painful, but I did it.