is it posible

[kevin lassonde]

is it posible to do a reef tank in a 20high if so what would be good?

 

[fender]

very possible. High tanks are nice for DSB setups. make sure you have good water flow, other than that, it is just like any other reef setup - just a little more difficult to keep stable.

 

[kris walker]

Kevin, they even have successful 1-gallon mini-reef tanks called "nano-reefs". Just FYI.
sam

 

[jacksonpt]

yea, definitely possible. Like fender said... high tanks are especially well suited for DSB. However, because your tank is higher than a 20 long, you might need more intense lighting to penetrated the additional depth. It will depend on what you want to keep, but it's worth thinking about now so you know what you've got ahead of you.
Good luck!