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Technicly the amount of life found on them can be different. Usually key and gulf rock with have more biodiversity than fiji rock but fiji rock is usually covered with more purple coraline.
About half of the total weight of the rock in my tank is figi. The other half of the weight is tonga. I would go so far as to say their is 200% more tonga in my tank as far as size goes. The figi pieces are my favorite though. If I had the money I would have gone all figi.