Update:
So the Colini went into the tank last Thursday night. As I left the tank to head off to bed the Colini had found the surge tank outlet (2" bulkhead in end of tank) and had made that her little den. However, when the surge isn't surging that pipe is also the home for a giant lawnmower blenny, who takes turns with an Obese Orange tail damsel.
With the Colini in the pipe, the Orange Tail Damsel, was backing into the pipe and kind of keeping the Colini corralled inside.
Last weekend I diligently watched the tank for a glimpse of the Colini. Flashlights were brought out angled at any opening in the rock work trying to catch a glimpse of this fish. Golden angels were spotted, Pipefish were spotted, Anthias in crevices were found. And a Rosy Solon Wrasse, which went into the tank 6-8 months ago and was never seen again, was found hanging out underneath my Monti cap colony. But no signs of the colini, not a glimpse, a fin, or a carcass.
I kept up my peering and prying into the tank all week. On 2 nights my wife said, 'Just start pulling out the rock so you will feel better." My wife loves the fish tank, but has no idea what it takes to start pulling rock out of it. And I'm not pulling rock out of my tank to find a fish for my own conscious.
Last night I fed the tank just about everything I had in the house, and went flashlight searching.... Zip Zero Nada.
Today Lawrence/Bullitr came over to pick up some Xenia, and while we are looking at the tank the little Colini comes out of a cave and makes an appearance. And then sits in the cave 1/2 visible with 2 Venustus, then with the Golden Angel and then with some Dispar anthias.
She doesn't look skinny, and I saw her picking at the roof of the cave.
I added a bunch of food to see if there was any interest, but once the fish in the tank got excited over food, she vanished into the darkness again.
But the first week has passed, now with a couple of good visual sightings, and seeing the fish moving calmly and slowly I have some confidence in the fish.
Dave B