(Daphnia and krill) are readily accepted and eagerly eaten by the fish. Tetra FreshDelica Krill 16x3g. Tetra FreshDelica Daphnia 16x3g. Tetra FreshDelica Foods (tube) 80g. for aquarists who want to give their fish a little treat every now and again, whereas the large 80g tube allows aquarists to spend a lot of.