Today I bought my first two fish, an ocellaris clownfish and a firefish. I float acclimated them for about an hour, and released them into the aquarium. My concern is about the firefish. All through the car ride from the store and through the acclimation process, he was very sedentary, laying motionless at the bottom. Probably stressed out. He looks pretty normal, though a bit thin, so I’ll try feeding him. However, after about 15 minutes of happily exploring the tank, he got sucked into the intake, and I had to turn off the filtration until he got off. Since then, he’s been laying down on a rock. Should I be concerned?