Clownfish Nemo fat

Nemo fat. I live with 2 other clownfish. One Nemo other Moo Moo. My name Clownfish. Nemo swimming funny. Being wiggly and in line. Nemo is staying close to top but Nemo always been like that. Not sure if Nemo ok. We all usually would leave Nemo alone. Nemo not any less active. Staying at top like usual. Is Nemo sick? Is Nemo fat? We not so sure. Am worried.