Originally Posted by
Kris
A gyre and a gf are forces in nature that can move stuff around.
The water motion (currents) in the tank serve to deliver food and nutrients to the attached reef organisms and it also helps move/remove wastes. In general you don't want to put a large current obstruction directly in front of the path of the current generator as that will tend to defeat the purpose of the gyre for making flow in the tank . If the rock is too close to the gyre there is a potential for excessive water movement that could, inhibit coral growth, or possibly topple the rock structure. I can't tell from looking at the towel how that might all work out, just a thing to be aware of.
Gyre good, rocks good, current interaction between these needs to be thought out.
If the stack was on the other side of the tank it would be further away from the gyre, but the stack would then be in the foreground of your view, I think?