Wow. Thanks everyone this has all been truly helpful. I initially wanted a Halfmoon but the Petco Bettas were either dead or incredibly sickly looking. So I went to the only other pet store in town they had one Dumbo only and at first he was swimming fine then he just laid flat at the top of the tank. I asked the employee and he said that the fish was fine some of them are just weird. He also said they'd only had him for about a week and that he was probably younger but couldn't give me an age. I took a gamble and bought him I felt kind of bad for him and I thought if there was something wrong a nice 10 gallon tank would be a step up from the tiny thing they had him in.
I had googled Dumbos to see what they were "supposed" to look like and I assumed they all had the halfmoon tail. Then when I got home I researched a bit more and realized he might look like a Plakat. Then I started wondering if maybe his tail just hasn't grown right. Now I am wondering if this poor little guy has been neglected. I think I said before he is starting to get color. I fed him today I skipped yesterday because I didn't know when he had been fed last. I have also been monitoring my tank with the test strips it seems to be doing good.