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Like has been said depends on you’re system but acros would be my preferred choice for that size tankI dissent slightly in that some leathers and toadstools get really big really quickly. It wouldn't be long before that was all you would be able to see in your tank. Similarly, I have an elegance coral that has grown enough in 6 months that it would take up half of a 15 gallon tank all by itself.
Otherwise, tank size won't have much impact on coral.