I would check to see what the humidity is before I bought one. My tank loses about 4-5 gal
a day. The sump room is in an unfinished part of my basement. I try to keep my humidity in the low 40's. The dehumidifier will add heat to the room it is in though. The one I have has preset humidity setting - dry , dryest, etc. This I hate. The dry setting holds at 50% and the dry I cant figure out where it goes. Humidity will hold 42% and it still runs 24/7. Might need a bigger one ...
Make your you size it right.
*180 gal Display, 100 gal basement sump, 33 gal refugium, 3x250 MH, 2x160 VHO actinics, zoos, some softies, LPS & lots of acros and other SPS.
*100 gal prop tank plumbed into main system w/ 2x96 PC lights and 1x150 MH,