my kigomas have been in my tank for about a week now, when i turn the light on they all hide and dont come out until i turn the light off and dont come near the tank. how long does it take for the shyness to go away or is this common. also i already have 4 in there about 2 to 3"s can i add 2 more from the same batch that i bought them from or is there gonna be any territorial issue?