I have a ricordia yuma that has stung both my favia and a zoa frag. The favia recovered quickly but the zoas are still hurtin.

Not much, that white branch is gone, the rest should recover on its own though.

I had a Frogspawn succumb to RTN this summer and the tip (which worker very well) was to up the flow on the coral for a while. I don't know if the same would apply for an SPS as they already need high flow...

Mushrooms & gsp will sting and are both bad companions for sps. Give some distance between them. I'm pretty sure that mushrooms and other coralmorphans are actually in the anemone family and will eat your other corals.

i have a birdsnest that is in contact with some gsp and no ill affects. They both seem to be keeping their eachother at bay, if anything the gsp has recided a bit where they contact. But ive definitly had sps stung by ricordia, and in my experience the bleaching has been localized to the contact area.

Thanks for the help everyone.