180g cube w/55g sump. Most all open to air. Beckett skimmer, plus a turf scrubber w/cooling fan that runs at night. During the day the lighting pendant is cooled by a standard type fan, sitting on a ledge.
In the winter, with the HRV and woodstove running, {dry air}, I evaporate 3g/day. In the summer when the relative humidity is higher, its a fair bit less.