I've had some interesting results feeding with the test tube. After success feeding Caligula grocery store shrimp with an open test tube, I've been trying to get him to learn to remove a stopper in the test tube. He gave up after about 5 seconds and hasn't since touched the test tube while it is closed.
Last night, I placed the closed test tube in the tank for about 10 minutes before removing the stopper. Almost immediately, Caligula came for the shrimp once the stopper was removed. I thought this might be because he saw the feeding claw so tonight I repeated it.
I placed the stopped test tube into the tank. Caligula clearly saw it and moved around the perimeter. He squirt water/kicked up sand in my general direction several times, I believe in frustration. I waited for two hours before finally removing the stopper. Within 15 seconds, Caligula retrieved his shrimp.
This experience leads me to believe Caligula (wrongly) believes that he cannot open the stopped test tube. He recognizes, though, that he is able to get to the food once I remove the stopper.
Last night, I placed the closed test tube in the tank for about 10 minutes before removing the stopper. Almost immediately, Caligula came for the shrimp once the stopper was removed. I thought this might be because he saw the feeding claw so tonight I repeated it.
I placed the stopped test tube into the tank. Caligula clearly saw it and moved around the perimeter. He squirt water/kicked up sand in my general direction several times, I believe in frustration. I waited for two hours before finally removing the stopper. Within 15 seconds, Caligula retrieved his shrimp.
This experience leads me to believe Caligula (wrongly) believes that he cannot open the stopped test tube. He recognizes, though, that he is able to get to the food once I remove the stopper.