The first fish is a silver veil. The second is either a hybrid black or a DD black (it's too dark to be black lace). The pair are not koi but gold marble. They do not appear to have the blushing gene which koi carry.
I really dont know whats wrong with his fins.
Maybe fin rot, i have aweskme water quality. I just got done doing a check.
My very black angel whom ive had for longer is now showing white frosted stuff on her ventral fins.
No not ich my tank is to warm. And i know ich i had a run in wirh it a while back.