One time I changed his water 100% and he started to do this weird behavior. The gills moved big and created huge bubbles out of them. He seemed very alert somehow and kept darting to some point. I was very sad but he was OK after couple days. I changed 100% water and he doing it again. I am so worried. He's even making sound when he gulping water. What's wrong with him.. Hiccup? It almost looks like it.
