I have a new betta in a 5 gallon tank thats cycled and has a heater, filter on low and some plants. I've done all the tests and it tested 0 on everything. He was hiding for awhile on the bottom and not swimming around much. Now he is swimming around but he is going in tight circles quite a bit, kind of like a dog chasing its tail. He suddenly darts all over the tank too. He's staying right near the top most of the time now. He also seems to be breathing heavy often. His gills are moving a lot. Since he's swimming like that he has tore up his fins a bit. Do you think he's sick or is it because he's not used to the tank yet. I have Melafix would that help. Thanks.