bioballs

this tank that im setting up is a 125 gal. bought it used with all the stuff,the sump is a 40 gal. the person that i bought it from was running bioballs and small chunks of rock inder the bioballs in the inlet then through the baffles into a subgrate then through baffles again into the pump chamger to the tank. im new to this type so how should i set up the sump so its right. thanks for any help

 

i would ditch the bio balls all together and if u are running a skimmer add that middle chamber then return pump in pump chamber if thats the kind of sump i think it is

 

Hello there
The thing with bioballs is that they are generally considered obsolete for saltwater aquariums. The reason for this is because they are overly efficient at processing NH4, NO2(-) into NO3(-). Nitrate is a huge problem in saltwater aquariums containing corals. Having an overproduction of NO3(-) is...well...not good ><

Like most people on this form, I highly recommend you to ditch the bioballs in exchange for live rock. Unlike bioballs, live rocks have the capacity of denitrification (conversion of NO3(-) to N2). This is due to the anaerobic bacteria that live deep inside the rock. Be sure to choose porous (full of holes) live rock.