new 200 gal tank for my oct

A 200 should be fine. The vulgris will grow to be good size but maybe not as big as in the wild.
On a 200, I would recommend a flow rate that changes the water in the tank around 8 times a hour. A 100 gallen sump will be great. The 180 I have been gathering stuff for is going to use a 75 gallen tank for a sump. I will also have a aquaC ev400 skimmer and duel bulk head overflows.
chris
 
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