Well, that questions is really going to depend mainly on your budget. I assume if you are wanting keep simple softies you are not looking to venture into the more expensive LED's so if it's T5 you're after...Personally I would go minimum 6 bulbs (6x80w) or 2 36" fixtures of 6 bulbs each (2 fixtures of 6x39W). Soft corals would look and do quite well under that. 8 bulb would give you even more options in coral.
You could keep some very basic softies under a 4 bulb, however if it's in the budget you would never regret going 6 bulb.
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