Yet another how many question

[HDAlien]

How many would you recommend for a 220 gal. 6' long tank? My system is a total mix of soft, LPS, and SPS, though I want to move to only LPS/SPS.

Edit: I want to get good wave action going in my tank.

 

[EcoTech Marine]

I'd start with two, one on each side, and then decide if you want more later. For a strong surface wave you might benefit from having three, but you may be able to get a good wave going with only two depending on your rock work.

-Tim