Really sorry if this is a common one guys and already been answered im totally new to aquaponics and am having difficulty balancing my water levels in my aquarium i have two proposed beds one with a bell siphon which is filled from aquarium and drains into bed below which is then pumped back into aquarium - 35litre aquarium...im finding that i cant seem to get a balance in water levels ...same size pumps - i first figured that id get a larger one for bottom tank as it would need extra head height but hpw much more powerful? Really need to be taken by the hand here!!