Optimal setup for 90x90x160 tent with 600w hps?

So i just germed 3 dinafem blue hash and 4female seeds grapefruit.

Im hoping all will make it so i can try to get 7plants into flowering for a mini sog or something.

But what is your opinion?

Is it better to have maybe 4 plants in that space or s hould i aim for quantity?
 
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