A friend who breed LF gold leopard danios, almost the same thing, uses a 10G with an UGF covered in marbles. The UGF uses a very weak stream of bubbles. He feels it helps keep the water on the bottom of the tank from being stagnant.
He uses multiple fish, I don't know the M/F ratio off the top of my head. He conditions them for a couple of weeks and leaves them in the spawn tank for a few days. However long it would be before the first fry would come up above the marbles. Then he removes the parents. He ends up with multiple spawns all about the same age, all in the same tank.
Before that he used a sandy substrate with java moss & najas and vacuumed up the eggs which would hatch in a tub or whatever.
violet
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