Oliver, thanks for the forum. It is very helpfull.

My question relates to fish tank and growth bed size ratios in terms of fish stress. I’m not trying for pin point accuracy in terms of volume – just a general understanding.

If I understand the 1 to 1 ratio as presented, a flood and drain system with 2 growth beds will eventually cycle to a point where both growth beds are filled with water (Just before draining). Taking into account the volume of the media, this would require ½ of the water from the fish tank. Hypothetically speaking a 24” high fish tank would then be temporarily lowered to approximately 12”. Assuming this is true;

1. Would the lowered fish tank level cause any stress to the fish?

2.Would this argue for a sump tank to keep the fish tank level constant?

Thanks