i'm sure this has been covered elsewhere, but i just wanted to double check. i just got a new brain and i have it at one end of a 36 inch tank. at the other end is a seio 620 pump. the nozzle is not pointed directly down at the sand where the brain is, but there is what i would call moderate flow. should i adjust the nozzle so that the sand where the brain is gets "low" flow?
here is a pic
here is a pic
