Anchoring food for inverts?
So a couple months ago I got some baby Maine lobster for my ten gallon tank, and everything's been pretty peachy so far (although through the law of natural selection there are now only two remaining). I've been feeding them krill and silversides, which they (and my lone hermit crab) seem to love, but I've just been letting them settle to the bottom on their own.
This is an issue because they've buried themselves underneath my DIY background (there's probably an inch gap to the bottom of the tank, which I filled with sand) and don't come out except late at night.
So, feeding goes like this: drop whole fish/krill in, watch hermit crab get excited and drag it about the tank, watch as a pair of claws and antennae appear from the gloomy cave... and about half a second later, the entire krill/fish has disappeared into the cave.
Any ideas for anchoring the food to a rock or something like that so I can actually see these guys?