Hey everyone, I have a 20 gallon freshwater tank (cycled) that at the moment has two platys and three guppies. My question is about one of my guppies,named Snoopy. I have had him since November of last year and I have always wondered about him. Here are some old pictures of him. These first two are from January of this year, he is the yellow guppy. This from March of this year. (picture I took of him after a pea incident he had where it got stuck) This is this morning. I am worried that maybe he is getting thinner (wasting away). He appears longer now especially his tail, like he grew and maybe that is what is making me think he is getting thinner. I wanted more experienced fish lovers opinion, I have looked at my other guppies and at the LFS and Snoopy appears long but not as thick. I know all living things are not created equal and maybe he is just like that. What worries me is that I had a dalmation molly at one point (no longer with us ), she has been gone for several months now. She started with velvet (I think that is what it was), but eventually she became so thin and actually developed a spine deformity. I think she had wasting away disease or fish Tb and I read that it can be transmitted to other fish in the tank. She was in the tank with all my fish at one point except one of my platys (got him recently). I am just scared that maybe he just now showing symptoms. I notice how thin he is from looking down on him as his tail seems thin compared to his body (more so compared to my other fish). I am kinda leaning towards that maybe he is just like this cause I think his tail has always been like this since I got him (as he has always seemed slightly thinner compared to other guppies I have seen, ever since I got him). Here is a video of him today. [video=youtube;t-wqxK1frk0]https://www.youtube.com/watch?v=t-wqxK1frk0[/video] Other than his physical appearance he acts fine and eats like a pig (Maybe I am not feeding him enough??). His waste looks normal, I think last I noticed (I will double check on this). I appreciate any thoughts, comments, or replies. I just want to know if I should begin to worry or not. Thanks all.