Hi I bought an AquaReef 400 ( already have an AquaReef 300) and the LFS
told me to buy a different sump with refugium for an extra $280. I am trying to sell the original sump with bio balls with no luck and am wondering if there really is much benefit in the sump he sold me. I have been reading up on sump vs refugium and people have varying opinions, saying there's risk of the algae taking over the DT and it's just another thing to clean. I have read about reverse photosynthesis to stabilise PH over night and also the refugium reduces nitrates / phosphates and increases oxygen BUT it's meant to be low flow. If it's a compartment within the sump, wouldn't it be the same flow rate as the return pump which is generally high? I have mandarins but am very fortunate as they eat pellets and frozen food so copepods are not a priority but would definitely be a treat to add to their diet. I have attached pics of the tank 400litres) the sump with bio balls and the other one which I am thinking of taking back for a refund. Which is better and what do I put in the refugium? Deep sand bed, LR
and chaeto? Thanks.