The algae clip is plastic. It looks weird in the pic because the half a sheet of nori is on it and the nori has been in the water for a day so it’s all flakey.I’m not sure I buy the infection idea
Forgetting the fact that the gems went through prazi
Flukes always possible
Fish arrived pristine Tuesday
By Thursday looked as pictured
Hard to believe that much damage that quickly
If you look at qt tank algae clip looks all corroded
Something is going on in that tank