From what I've read, Greens (tarzo) are distinct form all the other discus in DNA, and Blues, heckels and browns are so similar they can not be distingueshed as separate species, All 4 types hybridize where their ranges overlap. Wattleys original cross was a blue to a green so most domestic discus are most likely hybrids, something I always argued against in the past. I always thought there was aquafasiatus (green, browns and blues) and heckels as the only two species. Live and learn!
An empty tank is a terrible thing to waste!