i see your signature shows your business is in Pearland...i grew up there. i went back to pearland about a month ago, and i couldnt recognize it. its blown up. it has probably been about 5 years since the last time i was there. i can tbelieve someone hasnt opened up a nice fish store there. could be a business change in the future for you. HAHA. sorry to intrude on your post, i have never kept Vic's but i am interested. im all about Tangy's right now. good luck with your search
always go for the larger tank IMO.In a 20 gallon id start with 6 multis and soon enough, there will be more then you know what to do with.for a 20 gallon tank, id stick to a species only tank, if you go to a 33 gallon, then you can add in some dwarf cyps.HTH