Hmm, a 180?
I suggest you do a little bit of reading before. Think about a 3ft + fish trying to turn around in a tank that is only 2ft wide. This is the smallest commonly available true shark in the hobby. It WILL exceed 3 feet if well cared for. It needs swimming room. I would say that at 12-14" it should already be in a tank at least 6ft long x 18" wide, minimum.
Everything Patrick outlined is also true.
There are many other species of slightly more aggressive or cool looking critters you can try if you are looking for a type of predator. Some ideas that come to mind:
- Dragon Wrasse
- Groupers of all types (really cool ones, like miniatus groupers even, bright red with bright blue spots, and yet still a 'machine')
- Leopard grouper
There are many types of large wrasses, groupers, parrot fish (saltwater), that would be pretty cool to try in a 180, or even some of the smaller eels in the moray family.
Good luck, and please reconsider the shark!
Chris
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No more tanks  - Laying off the ReefCrack for awhile!
Cheers,
Chris
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