Hi all. I had gotten JB the fish this past summer and he's a very special fish in so many ways and means a lot to me. I would really appreciate it if you could do your very best to help me out with my situation. I do a lot of research on these forums when I think he might be sick, but I had never posted before, but I think I really need some specific advice now for JB's particular condition.
He's in a 1.5 gal filtered tank with lots of colorful plants and tank decor, a spongebob toy is also in there, as well as a betta hammock. I change his filter once every month, and I do a full water change every two weeks. I also do a partial water change everyday after I take out any uneaten food. I feed him once each morning, normally with a small pinch of flakes and one or two blood worms or pellets. I used to have live plants but when they began to die I threw them out. He's a beautiful crowntail but I started noticing in the summer that his fin tips were bending. I tried betta fix, and I also tried polyguard later on. He later seemed to develop this white little growth at the base of his tail, it sticks up from the surface of the tail. Also a long piece of one of his fins fell off and it seemed a bit red or bloody from where it had fallen off. At this point I took him to a vet specialist for fish. The vet office ran a sample of my water and they told me all the water conditions were great. The vet did some scrapings on him and used histology to determine if there was a parasite of some kind and found that he had a parasite he had never seen before called Ambiphrya. For treatment, he gave me formalin and told me to add 0.5 ml into 1 L of water, and to keep him in this water for one hour and then to put him back in non-formalin water. He said to repeat this for three days. I followed his treatment. I also cleaned his tank and all its items really well, including the live plant with bleach and made sure all the bleach had been rinsed away and cleaned off. He lost some stress coat I think from the formalin, but overall he seemed to recover well from the treatment and the part of his fin that had fallen off had grown in a little bit. Lately, I had been noticing there was some (I'm not really certain how to describe it) dark blue thin pieces of shedding on the bottom of the tank but I'm honestly not sure if they're from him or from something in the tank. He's a very active fishy and has continued to be very active, which I find to be a good sign. He normally attacks the spongebob toy, but yesterday he continued attacking and flaring very aggressively for quite some time so I was afraid of the way it was stressing him out so I took out the toy. He still has that little white growth at the base of his tail but it seems to have broken in half a bit. There's some black coloration where the scraping had been done on one side of his tail and a little around the white growth on the other side of his tail. I'm concerned about his health the condition of his fins and tail, and at this point I want to ensure that I've stopped the progression of this disease or the parasite or whatever he might have. So, I'm very confused if I should give him one treatment of formalin (but I worry it may be too harsh), if I should try aq salt, or if I shouldn't do anything right now. I also would like to give him something to promote the regrowth of his fins and appendages. The vet said that because fins are fibrous projections like our fingers that they won't grow back. But please help me in anyway you can with some advice. Thank you so much.
I've included pictures of both sides of him, one side has the black mark and the other side has the white growth. One is a picture of him from before. And one is a picture of those sheddings I picked up from the bottom of the tank when I was cleaning.