I bought 4 male guppies last week to go into my cycled 10 gallon. Three of them hang out together 90% of the time, however one of them hangs by himself a bunch either near the top corner or at the back. I took him out a minute ago to see if I could get a clear picture to see if there is anything wrong with him. I'm new to guppies, so I want to say that his top fin looks maybe a bit fuzzy? I'll attach some pictures shortly so maybe someone else can give me a better understanding as to if he's simply a loner or if he's sick. (he's the one in the center) Close up shot. (I have a 2.5 gallon I can put him in if you think it's safer. These were all from the same store and added at the same time.) Here's a closer shot.