to removing the bio balls from the wetdry?
yes, definitely. By eliminating the bio balls you direct all biological activity to the live rock where nitrification & denitrification can take place simultaneously >From what I have been reading, for the skimmer to be most effective it should take the water straight from the tank before any pre-filtering. yes, I suggest having the sump divided into 2 areas- one “dirty” from tank to skimmer- one “clean” from skimmer back to tank. This takes 2 pumps- one for the skimmer one for the main return to the tank. Water flows via gravity from the tank into the sump box. What I was thinking of doing was splitting the drainage from the overflow so, half goes over the bio-ball the other half goes right into the sump. Providing you have enough rock