I am on the waiting list for an L2 rev4. In the meantime let me introduce you to my aquarium. It is a 72"x18"x20" reef with a few softies and LPS. It is a bare bottom acrylic with a DIY 36" wide sort of coast to coast overflow box made from black acrylic with and bean animal overflow. Below from left to right is a20 gallon I use to mix new saltwater, an ATO reservoir and another 20 long serving as a sump. In the sump I have a old Euro-Reef CS6-2+ skimmer a 4x4x8" block of Cermedia and a GFO reactor and a heater. Flow in the main tank is provided by a Hydor Magnum 8 a Sicce Voyager 3 and a pair of Hydor Koralia 1050. Lighting is a 4x54w T5 fixture and a power compact. It has been up for around 5 years and has been through good and bad periods. Bare bottom seems to work well for me if I siphon frequently but when I get too busy things seem to go south fast. At that point it takes a lot of water changes and GFO to bring it back. I currently have a blue hippo tang a banded hawkfish and a pair of clowns.