Who Gives A Fish Forums

Thanks, all. Room temp's pretty stable, so it's gotta be the heater. Gonna grab an Eheim and a controller this weekend.

My tank's been having wild temp swings lately, like 74 to 82 in a day. My Zoanthids are looking rough, kinda closed up. Anyone else deal with this? Running a 40-gallon with a cheap heater, maybe that's the issue.