Orange Skunk Clownfish, Strange behavior

[Wannabe]

I have a small orange skunk clownfish in my 10g nano. The question/ concern I have is that unless its time to eat all it does is float sideways under my aquaclear discharge. Come feeding time it swims and eats as normal and is quite active. Its shares the tank with a green chromis of about the same size. Ive had the Skunk Clown about 3 weeks now and this behavior just started over the weekend. It was previously fairly active. Any help would be appreciated.