green coral

I don’t know if this is the right section to post this in but I wanted to show some pictures of my nano tank. I’m still experimenting with things and have struggled with red acros/digits but I think I’m doing okay. What do you guys think? I’m prepping for a massive (UNS R90 or 120) upgrade once...

I don’t know the name of this, but are the two “green” corals, in the back, the same? I have several of these and some are nearly translucent and others are vibrant, glowy green. Didn’t know if some are unhappy and need to be moved? Thanks!