So I've had Alexander-the-Great for about a week or so now, prob more like a week and a half. Anyway today I noticed he seems to have a swollen area where his first two bottom fins are, it seems red around the swelling too. He's swimming and everything like usual he seems perfectly normal except for some swelling. He has some tankmates, a small school of neon tetras who don't bother him and a plecostomous who also doesn't bother him. Anyway should I be worried, should I treat him or should I leave him be because it's nothing?