Hi I have 4 fire bellied newts in a five gallon tank and I just got a green tree frog. I Put a large bowl in the tank instead of the 50% water thing. one of my newts seem to have been getting sick all of a sudden. He seems to not have any energy when he swims and just floats there. Hes not acting like usual and they are rearly going into the water. Whats wrong w/ my newt whys he sick? how can I help him?