that is my guess on entire costs for my 75sps(more a mixed reef now). electricity for 2x54w t5 and 2x250 fixture bumped bill by $20/month with halides running 6 hours a day. plus vortech w/backup, 7"fan, fuge light, return pump, skimmer, phosban reactor, 2 heaters, moonlight, and 2 powerheads in sump for detritus. One bucket of salt, 150gallons of water change, 2 t5 and 2 halide bulbs a year. It all adds up. I consider new equipment and livestock maint. fees as well, but I only get a few things a year.