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The largest O. scyllarus recorded is 175mm and it is rare to see one larger than 170mm. If you get a peacock larger than 15cm you can expect it to live at most a year or two. In my experience the size of the aquarium foot print is not as important as water quality and water quality is more directly correlated with volume than substrate area. Most of my large O. scyllarus are kept in 20 gallon tanks and I seen no evidence that they do worse in terms of longevity than animals housed in 100 gallon systems. Notice that I am only discussing health, not well being. That is determined more by diet, substrate type, lighting, activity near the aquarium, etc.
Roy
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