Yes I agree, I don't know how these are rated, but I have two of the RW-4 (next size down from yours), and at the lowest setting they are almost too much for my 120G.
The Koralia's produce a wide gentle flow, while these little guys just kick it out strong. At anything other than the lowest setting, the plants couldn't stay rooted. I assume that is what the reef guys are looking for, and why they are popular with them.
The Koralia's produce a wide gentle flow, while these little guys just kick it out strong. At anything other than the lowest setting, the plants couldn't stay rooted. I assume that is what the reef guys are looking for, and why they are popular with them.