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Doesn't matter how much you put in now.. eventually everything will grow out of that tank without fragging/pruning them back. Corals don't stop growing just because of tank size.. they don't know they're in a tank. If your lights are good and your water conditions are ideal, they will grow... for ever.
it's your garden. you grow it how you want. corals just keep growing. when they get too big we cut them back and sell the overgrowth to another reef keeper. buy a few little frags and see how they do. then go from there.