both of these guys are on here..
anemones will often shrivel and hide when stressed like this.
in extreme cases when they have been damages, they can actual purge there innards.
this "spawn" stuff you saw was likely the anemone simply purging more of the stuff from inside.
here are my recommendations
leave the water alone and the tank,
place the rock in a medium level of the tank with low to medium flow
if and when it starts to fill back out or up, then give him a few more days to be monitored. after a few days start feeding small amounts some some meaty food, like shrimp, crab, clam, oyster, etc. then see how its doing after that..
