i would buy an angel like that cos it deserves a home like any of its "normal" siblings and i generally prefer different things as well cos guests are always amazed by the unusual even if they are just a deformity.
does your angel do ok with regards to competing for food as the rest as all able bodied?
have you noticed any other things wrong with the angel due to its deformity?
there is a site on the net that deals with deformed fish. cant remember a name but i remember seeing pics of discus that look like bike cogs. very strange but cool at the same time.
hows your ram doing with those con hybrids?
will it get owned in a couple of months when the cons get larger and more assertive?
sorry for all the q's but your mix is a different one and asking is in my nature (an engineer).