I brought my new betta home a few hours ago. He is a crown tail called Fippy. He appeared to settle well into his new 20L tank (he is the only fish in there); which is heated at 28 degrees and has a filter. He has been swimming around quite actively and exploring his new home. However I have just noticed that he has a pale cotton wool/slimey like subtance on the edges on his fins and a little bit near one of his gills. There does not appear to be any on his head or body.
He also seems to be resting quite a bit now - does anyone know what i can do?