My Apistogramma cacatuoides don't seam to swim out in the open very much. They are housed in a heavily planted 75 gallon tank with blue rams, gold rams, one angle, and several tetras. They were the last fish to be added into my tank; about three weeks ago. When I have seen them out in the open I did not see any of the other fish harassing them. They seem to spend most of there time at the back of the tank. Do they need more time to adjust to my tank? I would very much like to see them swimming about.