True baby brine is better then adult because of the egg sack still attached.Baby brine shrimp is extremely nutritous
Yes asmagpie said get a variety in but try and cram pellets in
It's quite possible. Unfortunately. I wasn't overly worried about it but the thought had crossed my mind. I caught one of my dels with a syno in his mouth last night when I got home from work. I saved the syno, I haven't gone to check on him this morning (he's in the sump) but it goes to show you never know.
I've had corys before and have never had Cory on Cory agression to the point of damage so yeah my guess is your rope thought this could be food. Fortunatly your rope and my del were unsuccessful in their attempt for their own sake corys and synos have spikes that can lodge in their mouth or throat and then you lose two fish. I'd get some tilapia to suppliment your ropes diet until it cones around to pellets. But you may have to get rid of either the corys or the rope for everyone's safety. ....sorry.