Hi i have a 40 gallon reef tank im currently using only live rock for filtration. I have a Red Sea Prizm Deluxe skimmer two aquaclear 402 powerheads and about 45pounds of fiji live rock in the tank along with 40 pounds agra-live live sand. i have been told that this should be good filtration for this tank but it just goes against what ive learnt in freshwater systems. So is this truly enough filtration and if so what type of bioload could i support. Would it help to add a wet/dry filter or canister filter? Also looked into a 15gallon sump with sand and rock if that would help any advice would be appreicated.