Hello all, I have two Dempsey's in my 55 gallon tank, I have had them for 5 months. They both stay hidden underneath a cave I have inside the tank. They only come out when I drop food in the tank, even still they are hesitant to get the food unless I move away from the tank. Anytime I go near the tank they quickly run and hide. How do I get them to be comfortable with me?