Ive had these neon tetra for a year now, and they have been fine. I recently moved them to my 10 gallon and they are no longer playful or active. My 10 gallon was already cycled 1 year ago. Ive been treating with paraguard for 2 weeks and it hasnt made any difference. One neon tetra in particular looks to be in terrible shape and now seems to have lost control of swimming capabilities. Photos attached. I need help identifying what this is so I can tackle it.