On a diving trip too Sweden I stumbled upon the perfect food for the aquarium – tiny herring. They were sold in a supermarket as bait-fish. I have tried using white-fish bought from the aquarium stor before, but they apparently smell wrong, my fish does not react to them. But herring make them crazy. The cod ate 4 in 2 minutes!
Here is “Torben” as we call to most aggresive of my two cods after he swallowed his 4th herring:
The sculpins where not as fast in getting to the herring, but when the hermit crabs started to move them around the sculpin moved in.