Its depends on what you are after. As in are you buying the lot to admire them or want to breed them. For admiring, no its not a lot. With 9pcs, the aggression will be spread so that no one piece is stressed consistently by the alpha. Which means there is lesser concern (not none) with deaths as a result of male aggression.
When you want to do breeding, its advisable to house a pair in a tank. Not only does it prevent deaths of other pairs in the tank. You will also have a higher chance of a successful spawn.
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