So some details on this parasite issue....
1. Cinder is swimming very actively-- a little too actively. He's staying to the far wall and swimming back and forth, up and down with extreme bursts of speed.
2. The appendages are the exact same color as Cinder, which is probably why I didn't see them at the store. They look long and stringy.
3. If I didn't know any better, I would've called them just extra growths on his anal fin... as if it's growing out and layering itself.
4. The appendages/parasites are on only one side, the left side.
Hope this helps someone to help me help Cinder!! :o