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So I got my half moon betta fish 2 1/2 weeks ago. He is in a 5 gallon tank with a filter and a heater. This morning I was watching him and I noticed these weird "spots"(?) on his side. The spots are a light blue color ( almost as if a scale fell off?) and are not raised off his scales at all. He's swimming around the tank spending equal amounts of time at the top and bottom of the tank, is very active, and is eating fine. I'm really worried as this is my first time taking care of a betta fish and I'm already really attached. I've attached a picture below.