I recently purchased a 40G for the sole purpose of a frag
I mixed 20G of fresh RO
salt water and 20G from my existing 150gal tank which has some fish and about a 120 lbs of LR
in it. The sand is Caribsea aragonite sand. I dont want it to stagnate so should i leave a powerhead just at the surface ? or leave all water movement off for 2 - 3 days ?