I'm all confused. When I brought mine home 2 weeks ago, my P's where completely silver. Now they are getting some color on the bottom of their tail. I thought they were older than 2 months old but after looking at your P's, mine look about the same size of your 3 week picture and a little lighter coloring. I just picked up some mikasi frozen shrimp that my boys can try out tonight. Is it good to keep a feeder or two in the tank to keep my P's distracted?