I purchased a pair of percula clownfish a few days ago from my LFS. they were taken from a small 5gal tank which had a anemone it it they were hosting, and brought them home, aclimated them for three hours and put in my 34gal tank which is fairly new, only LR and one mushroom. Since I bought them they hover near the top of the tank, at night when moodlights are on they stay in one corner. They are eating alright but am a little concerned about their behavior. Any ideas?