3 days ago I realized 1 of my neons looked like a porcupine. I removed him and did my best to save him in a hospital tank, be died. Then yesterday found another dead neon and another one today. I did a very large water change. And all water parameters are normal. My fish do look like they have red gills and I did have ich 3 weeks ago that I treated with high heat (86).I have a 55 gallon tank that is fully stocked, I have been doing water changes every 2 weeks 50%, and this tank is 10 months old. I quaratine my fish. And the newest batch I put in was 5 weeks ago.I think this may be gill flukes maybe, what would be best thing to treat with?