Need Help IDing Tail Type

[Jumko]

Mermaid, your boy is a veiltail. You say you just got him, so the chances are he's still young and his tail might keep growing. Could also have some spade tail in him, but from what I've seen, those are extremely rare and unlikely.

Spade tail:

More info on spade tails here: http://bettysplendens.com/articles/page.imp?articleid=764

As for your female, it just looks like a healed injury that caused the cleft in her anal fin.

 

[Fractalis]

regardless it is a lovely black and blue betta

 

[uwanna]

Try here for some ideas on color and fin types

http://www.aquaticcommunity.com/bettafish/tailfinforms.php

http://watershed3.tripod.com/types.html

http://bubblesandbettas.blogspot.com/p/betta-breeds-tail-types.html

http://bettysplendens.com/articles/catview.imp?catid=857

Hope something here helps. They are certainly beautiful fish. Too bad the males cannot live together. What a great tank that would make.