I've had a Chaetostoma plec (rubberlip/bulldog) for about 6 months now. When I first got him he was out and about regularly, if briefly, especially at feeding time. He used to defend his mopani cave and fight off the silver dollars from the algae wafers. But he's got more and more reclusive, he prefers a crevice between some slate now where you can hardly see him and only comes out to eat his cucumber. Is this normal? & if it is any suggestions as to how to coax him out a bit more?