Well, looks like it is definitely going to be a bit of target feeding, so I can be sure he gets the nutrition he needs. At this point, everything I'm seeing is saying that my tank is too young to support a filter feeder.

I don't mind target feeding him if that will be enough for him, but I sure do feel a little like a dummy for having brought him into this situation.
Since I had read of people successfully supplementing them with algae wafers, I gave it one more solid shot. Tonight, after once again peering into my tank a few times and discovering not only that the shrimp was out, but that the corys
seemed to be resting; I tried once more dropping in an algae wafer, figuring that he might have a chance of getting to it first.
Well I was wrong. The shrimp never moved, but I also wasn't expecting to see what I did.
I dropped the wafer in and came back a couple minutes later, not wanting to get my hopes up; and expecting to see the corys had woken from their slumber to feast upon the wafer.
Everyone familiar with the story "The Tortoise and the Hare?" Well! What I saw was certainly a visual representation of it. I never would have expected my lumbering snail to get there first, and to be sitting on top of the wafer with excited sniffing corys trying to get underneath it. It's not like they didn't have enough today, with the other algae wafer they stole. But the snail was faster. Geez, and I thought everyone was kinda asleep...
So definitely have to target feed! All I can figure is my shrimp must at least be getting a little nutrition... he has already gotten darker and his back stripe is more intensified, which I have read is an indication of general satisfaction (though I of course don't know how true that is). I'm not sure what's swimming round in the water in a mature tank, but maybe I got lucky. I did have a bout with planaria really early on... but of course my piggy corys ate all of those that I could see.