Questions - Need some input

That nice little neon goby who just joined the DT is missing in action... he was last seen on Wednesday, by my wife, who saw him dart upwards followed by the sound of splashing water...

The tank is covered so it isn't possible to jump out, but he might have jumped into the central overflow column. Today I tried opening completely the overflow valve to empty it and force him out, but he didn't appear in the sump.... so, I'm afraid he might have died and was already eaten up by his ...

Found out why my "Green Star Polpys not extending"... caught a Mithrax crab red handed:



Now I'm debating what to do.... GSP grow quick... so maybe I can keep them for Mithrax food in parallel with the other stuff (Valonias and GHA)... so they don't decide to eat other soft corals like the Zoas and Palithoa...

I was thinking of moving the GSP to my new quarantine tank, but, with the lights off that tank is averaging 27.5C ...

Something strange is going on with my Green Star Polyps:


They are not one continuous colony... but all of them have the tentacles retreated for two days now. I thought it might be too strong a current so I turned off my MP10 pump for a while, but no, nothing changed. From the picture above does anyone see something wrong?

My other corals are OK (a Hammer ...