Well Min good luck with your new discus! Hans does have great discus. I have 14 of his . Ok first thing let them sit for the night maybe leave the light off for tomorrow. Try feeding in the morn. Young discus need to be fed a lot. As often as you can. These fish also reach a size of 6-7” so a 29g has got to be just temporary. You will need a 55-75 with in 2 months if they are growing correctly. Because of all the feeding and the small tank you will have to change water daily.