So I got Zenny, my 'dragonscale' betta (I don't think he's a dragonscale) from petco about two weeks ago. When I first got him he seemed like he was the healthiest one at the store and was all white with a blue sheen, but just within the last week or so he started turning a blackish (blue?) throughout his entire body, and the edges of his fins, too. I also noticed that he doesn't have any scales on his head. I have started doing the aquarium salt treatment as he does seem like he has some fin rot going on. He is in a 3 gallon tank with a heater, but no filter as I have him in an aquafarm which is suppose to be an aquaponic system that uses plants as the biological filter on top of the zymbac (nitrifying bacteria) I've added when I first got him. I've also added driftwood and catappa leaves to his tank to help soften the water and he has a cory as a tank mate(in a separate tank at the moment due to the aquarium salt treatment). I just want to make sure I am doing the right things and that he's just going through color changes and not any other illness cause I can't seem to find anything related to what's happening to him. I've attached some pictures for reference. Also, from what I've researched, he really doesn't seem like a dragonscale if anyone has a better idea of what he might be, please let me know as well thanks!