Hello everyone! I just received a betta (Baby Yoda) and I was wondering about the gender of the betta and the type that she/he is? I am also curious about his health. I am pretty sure his caudal fin has some fin rot but I also notice the scales at the bottom of his head are grey. I am not...

Really hoping that someone can help me. I've had my fish for about 6 months. He is in a 5.5 galling heated and filtered tank with readings at a steady 0, 0, 5 (ammonia, nitrites, nitrates, respectively). This all started about three months ago when I bought some shrimp to add to his tank. The...