Hi i have had six discus now for about 4 months i bought them wen they were 2 inchs, my biggest discus is about 4 inchs the other 4 between 3.5 to 3.0 inchs , MY problem is the 1 discus has not grown at all since i bought him and because hes smaller than the others none off them will let him feed. When i feed them now the small discus does not even seem to try and eat he jst sits under the bog wood until the food is gone and then hel come back out. any advice would be great thanks lewis