Yes. I had it running. I put plastic table cloth covers over the top to cover it and let it run without lights for 2-3 days. Everything was as if nothing happened.did you have it running? what did you do? I'm not seeing signs but it's been long enough id like to do it and with my reef tank in current limbo I was thinking it would be a good time to tent, but honestly I don't want to remove anything or lose my fish I've heard mixed reviews on leaving it in place... what was your experience? did you run your chiller? was it summer?