Also, depends on the size of the cube as they are not all the same.
Too many bloodworms can cause digestive problems in your fish - e.g. constipation - so putting a whole cube in your tank to feed just 14 fish is a bit too much really. Yes, they will eat it but it isn't necessarily good for them to have that much. Best if you were to defrost the cube and feed them half and if you can see they are still hungry, give them something else with it, say a bit of flake or dried daphnia etc.
It's also a good idea to defrost the cube in a little of the tank water beforehand, anyway, because adding it straight into the tank can dirty your tank water and make it smell.
I have a little cup I keep just for bloodworms and a pair of tweezers for adding them into the tank with - and I feed bloodworms about every 3 days now (used to do it daily until I found out it wasn't good for them) - and once a week I give the fish crushed peas to help prevent constipation and swimbladder disorder.
Athena