Blue Carpet--Thanks. After returning home from my own dinner, I tried offering a few small pieces of shrimp. The first one I put on the oral disc about 1/4 inch from the mouth (which was open just about 1/4 inch at the time) The BTA definitely reacted by "feeling" the food with the tents, but it didn't grasp it. I looked back about five minutes later and the shrimp piece is not in sight, but I don't know if it ingested it or if it rolled off and under or away from the BTA. So, I tried a second piece. Again it "checked it out", but didn't eat. After a minute or so that piece slid to the DSB near the BTA and one of my snails started in on it. I will try again tomorrow. Also can try some fish or other food items.
I do have some concerns about the post-dinner (my dinner) "behavior" of the BTA. I will put those in another post to get more eyes on the issues.
Thanks again!