the stuff we got is in a block, about 1/4 inch thick and 2.6 x 5 inches(roughly)
we jsut break off a small piece, and soak it in water and vitamins, until thawed nad no longer cold, then, are you ready???????
out comes old reliable, THE TURKEY BASTER, and give them a lil dose at a time, and when the fish slow down, we sotp, depending on you fish, it may require different amounts, but you sill figure that out, in a case like yours, we would give it almost directly to the fish needing food, sometimes this may help coax them into eating
HTH