Color morphs of discus are not separate species, they are color morphs, therefor the offspring would not be hybrids, just a new color morph. Not the same thing at all.
Pelvicachromis taeniatus and pulcher would create hybrid fry, IF they were to cross spawn. Pulcher are found in branches and pond extensions of the small Ogba river, south of Benin city, Southern Nigeria, while taeniatus are collected in Nigeria and Cameroon. I would definitely need to see documentation of that hybridization being a common occurence to believe it, personally.
Fish actually CAN tell the difference between species that people have difficulty discerning or there would be very little variation between the two species if they intermixed freely. Its basically what the classifications are based on, those unique differences.
Barbie
The one with the spots is quite pretty. I've had them for months now and they have kept the same markings. I have two with stripes and just the one with spots.. They do a great job on the side of the aquarium and seem to grow very slowly. I had put one in my ten gallon that was about the size of an oto to grow it out before putting it in a larger tank but it has grown less than half an inch in over a year. They also don't seem to *work over* broadleaf plants as bad as bristlenoses either. 
