Big update today since its been awhile since I posted.
Both crabs are gone! Ruby mithrax immediately picked on my corals, a few days later Frank (emerald mithrax crab), decided to eat one of my mushrooms and my Goniapora over night, it's not dead but it's still recovering(pics below).
If I ever buy mithrax crabs again I'll make sure they are females, because they are reportedly less aggressive.
Corals are doing great!
Goniapora is doing great and has recovered from frank's harassment
All the other corals are doing great as well, even the mushroom that frank attacked. (Pics below)
Finally a livestock update!
I got to cerith snails on Sunday they are incredible they are like trochus and nassarius snails combined, don't have any pics right now since they're under the sand.
The feather dusters are doing great and have grown 10x the size they were when I found them. They even propagated I keep finding little ones all across the tank, even right up against the glass! (Pics below) I also got a really cool red feather duster as a hitchhiker from sbb corals (pics below)
This was a really long post, if you read all the way to here thank you so much!