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Carding is what we do when we separate our bettas so they can’t see each other. Usually we have several jars and put an index card or other opaque object between them so they cannot see one another. Once or twice a day (usually just before feeding) the cards are pulled and the fish can flare at their neighbors. This is how we build aggression and teach them to display properly for shows.
You said you toss them in the spawn tank together, do you do anything prior to condition them for breeding?