Shawn,
Good thread except that it did not end with an answer!
I was intrigued that someone chimed in that wild reef temps. fluctuate quite a bit. So I think the 2 degrees is probably OK.
Marc,
Good article. Thanks! It looks to me like I am doing OK. Temp. is not a false reading. I can look at an entire week on a graph with Aquanotes and seem the exact same pattern. Temp., pH, and conductivity all swinging essentially together throughout the light cycles.
An interesting observation I have made is that when I added the extra opening on top of the skimmer, the temp. swing, while still about 2 degrees, dropped 1 degree on average. So instead of hitting 79F it is only getting to 78F now.
Also, in Aquanotes, the seasonal parameters for temp. show a single temp. on each day which is the average temp. for the latitude & longitude being emulated. It is not sophisticated enough to alternate temps. during the day/night cycle, so in reality, my lack of precise control because I don't use a chiller may actually more acurately reflect a real reef. I am sure there is probably a way to program the AC III to adjust temp. for day & night, but I don't know how to do it.
BTW, the ceiling is painted with bilge paint so the scum wipes right off! I totally laughed when I read your advice for keeping the ceiling over my skimmer clean!:lol: That's funny stuff!
Humidity fluctuates greatly in my tank room not just because of the tank but also due to the outside humidity. Since I have an open vent, when it rains, the humidity jumps to 95 - 100%. Then my humidity controller turns on the exhaust fan, which just brings in more humidity so I am experimenting with not using the humidistat. I have a clock with humidity and temp. inside the tank room and it also has a remote humidity & temp probe which I keep outside. This is giving me a leg up on experimenting with how the room interacts with the outside.