I suppose its horses for courses then as far as the Pepp are concerned, mine are fab, quite shy, BUT, whenever I put a new frag or piece of rock in, they come out and check it over straight away! I did have a bit of a scare when they started on my Xenia, but they only ate one or two heads(which regenerated in days) I was told these were probably diseased anyway and the Pepps could 'smell' it. have had no problems since.
I'd better start looking at raising some of the hatches they produce at regular intervals, because I have come to rely on them a bit!!