I've had them for about 6 months now and since day 1 they seem to always be lined up in the middle of the tank . They don't seem to swim much , they all basically copy each other . If one acts up they all do . The water is all good and they always eat with no problem . Also any advice on making the color pop? Still working on pellets but they are on blood worms and occasionally live feeders since they never eat many bloodworms . Any advice ?