when i was looking for to keep discus for first time, i bought 7 crappy discus for £20 from a local breeder who offered this bunch as he don't want to reduce the price on one in the display tanks. they all leftover fish from previous breeding projects. all skinny and malnourished looking ones. needless to say all dead in 9 loooooong months despite they were put in a perfect condition and good environment.
the last one died was looked like a rainbow fish....