Great build. Just ordered a 900 today along with lights, skimmer, Neptune apex systems, reef dry rock etc. etc. etc. Really like how you organized your electronics and dos with the drawers. Im still trying to decide how to handle my fresh water top off and what to do with the smaller split sump. Appears it can be used for the ATO or as you are doing a refugium and/or frag tank with apparently added flow. Hmmm... anyway thanks for the thread. Look forward to watching progress.