Well seeing it is blind so to speak and uses blindsight would it even have skills in spot or search? Since it does not move it would have not hide, move silently, swim, or other move-based skills. I would have to say perhaps skills in Listen (Wis), Autohypnosis (Wis), and Concentration (Con).
Seeing that it charms and dominates people alot, would skill ranks in Diplomacy be too far fetched?
Also, we need to add its Int Mod to the DC for its psi powers and for me to calculate its power points once we agreed we like that stats, which I do.
For its extra feat I suggest Psionic Endowment.
This allows it to spend power points to increase the DCs of the saves versus its power. Which seems to be what the author of the monster intended. Not a nasty monster versus physical combat, but as you are swimming by what appears to be harmless coral, BAM! You are mentally enslaved or being forced to talk to an intelligent creature. Or under the attack of charmed sea creatures and thralls of the beast.
Or do you have another suggestion for a normal mundane feat?
Racial bonus to disguise skill to look like coral? LOL.