Radion spread at 12" depth

[Royal Reef]

Realistically what kind of spread can I squeeze out of a xr30 pro on a sps frag tank

 

[d2mini]

Depends on how high you hang it.
The higher you go, the more spread you get.
What size tank?

 

[Royal Reef]

2x8 12" deep

 

[d2mini]

With the tank only 12" deep, you can hang those suckers high.
You'll still need one for every 2' of tank I would think.
Read the Coral Lab article. The radions over the shallow sps grow out bins were 24" off the water if I remember correctly.