Got him on Saturday :)

Lady at the pet store said he might have some sort of dwarfism but I’m almost sure his growth was stunted due to improper care :( She said they have had him since February so almost a year and he’s pretty small and I’ll take him to the vet as soon as I can to get him checked but I’m already so attached to him I hope he lives a happy life. (Also will upgrade tank soon I know it’s too small) any tips would be appreciated since I’m completely new to this apart from some YouTube videos I’ve watched.