Hello, I have just gotten some new discus for my 55 gallon tank and I have a few smaller ones and a few bigger ones, and one of my bigger ones is not eating I have had him for 4 days now and feed them black worms 3 times a day, but he still doesnít eat, but the small ones are quite crazy when it comes to eating and I donít know if it scares him or not sometimes he would eat a black worm then spit it out then i tried giving him some tetra color food and still nothing...any suggestions?