We had our MH 8" above the water on a 90, and they're about that far off on our present 135. As for polyps, I have some growing near the top, but they started out closer to the bottom and grew up. (I have some at the very top, and some at the very bottom now.)
If you can move them farther down, they might take off again.
I hope someone else can help shed some light on the subject (no pun intended)
Danielle
If you can move them farther down, they might take off again.
I hope someone else can help shed some light on the subject (no pun intended)
Danielle