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Great info! It should be noted that a cross between a double tail and a veil tail will result in all veil tails that carry the dt gene which will appear in f2. A true solid purple betta, although it has and is being attempted, has never been produced. Bettysplendens has a great post about it in the "genetics study" section. Marble is a highly unpredictable gene that "jumps around" causing the fishes coloration to constantly change, meaning you could purchase a beautiful marble fish you love that could completely change into a differently colored fish you hate. Also, there are many types of black. The one you displayed is a melano, I believe. Bonus fact- There have only been two recorded albino bettas, and one of them bred only once but he did not produce any albino fry. Albinos often die prematurely because they are bling and host many serious genetic defects.
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