Are you sure? I could be wrong, but he has trailers and I don't think I've ever seen a common with trailers. The trailers are only an inch long or so right now but he was kept in poor conditions so I'm hoping they will get longer....Also his pectorals are a bit bigger and spikier than most commons I've seen. I did more research and found he is definately not an Adonis because he has an adipose fin, but I'm still not so sure he's a common, can they have trailers?