x2 this is good info for the opThey can grow to eight feet and likes to cruise the open water.
This is what I actually suggest: buy a small jardini if you have them or grow out small silvers. If you really like them, you'll look for ways to upgrade the tank, 180 is okay for a jardini(others will disagree), 240 or better 300 wide for silver. if you don't like them, just trade or give them back to the lfs.
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