Hey, hey, a 2 & 1/2 year old thread resurrection! WhooHoo!
( Sadly, that's not even close to the record... )
Anyway, Blue Deltas are guppies with the "standard american-style" triangular tails, ( Delta-shaped, that is, ) and those tails are a solid deep blue color. Very nice fish. You'll like them.
Guppies.com is another very good place to look for incredible amounts of guppy info.
I think I'm going to sticky this thread since it's so chock full of guppy goodness.
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