Today i noticed my kenya tree and bubble were not looking well tonight i see a small hole on one my of bubbles of my bubble coral and the kenya tree looks terrible, the cats paw died today would that cause the water to change? Also i have a file fish are they known to eat these types of corals ? and another thing when i put the cats paw in the water i seen a quarter sized crab run out of the cats paw bright purple crab could not identify if it was good or bad since he went into the rocks pretty fast .