well i have both of those fish and the up and down is normal i had a few fish do that while they got familiar to the tank. my clown always swims around and hangs out in my leather toadstools. the firefish was shy and hid out for about a week under some coral. but after that he swims around and does his little gig or dance for some reason but its cool though. As far as feeding goes i just use prime flakes, and a few times a week i soak them in selcon. both are healthy, bright in color and i have never had any problems with them getting sick. but their both cool fish so good choice and have fun watchin them