My Question is should you take the dirt out of the worms before you feed the fish,and does the dirt build up in tank over time.The main fish that I want to feed them to is a fire eel and tire tack eel,they eat frozen blood worms now,they are in a 420 gallon tank with a lot of tank mates and I am going threw a 16 oz frozen blood worm a week,and thought it might be cheaper buying a box of farm raised earth worms to,what do you think?