Hi. I just bought a new crowntail betta on sunday. My tank is a 2.5 gal with a heater. I noticed that he is not really active and most of the time is at the top of the water. The top had a clear film at the top but I was told its nothing to worry about. I am worried that my fish has little white spots at the end of his fins. It reminds me of lice. Can someone please tell me what it could be and how I should fix it?