I decided to feed my neons and guppies the blood worm with a cone but it seems that they won't go near it! I thawed the blood worm in tank water first then put the cone in the tank stuck to the side of the tank with a sucker. They go nearish to it but won't feed, they are all healthy and ate the bloodworms that fell out of the cone but won't feed from the cone! My question is, how long can I leave the bloodworms in the tank before it messes with the water parameters? And, is it something they will eventually get used to it? I only feed bloodworms once every month