You'll have to position powerheads in such a way as to ensure water movement throughout the tank. That probably means some positioned near the bottom, others at the top. Point them in opposite directions because you don't want a swirl movement.
Finding the right shape of LR
is going to be the challenge. With smaller pieces of LR
, you find you need to stack the LR
up high. Inevitably, your stack structure will collapse down on itself and be a problem.
My hex is more tall than wide. LR
.com sent me a giant lump of rock. One big, tall piece that sort of acts as the centrepiece of the tank and I've avoided stacking altogether.