There is 30g sump with an asm G3 skimmer, mag 9.5 returm pump, and NO macros in the sump. I wanted the macros in the tank to get all of the nutrients for now since this is a newer tank and I didn't want the sump macros outcompeting the display macros. If it's too much for the display macros to handle, I can always add chaeto to the sump to help with the nitrates. The rock is from marco rocks and I seeded it with 25 lbs Live rock that I had from other tanks.