LOL! I know, and you would think it would be enough to heat the water, which is what I was accounting for, but amazingly, it is not heating up the water much more above room temp.
As for evaporation, I have noticed that and expected it somewhat. For the last week, I've topped off in AM before work and PM after work. So far, my evaporation rate has been a little less than a cup, which is affecting my SG by about .001 - .002 per day. I have the SG set at 1.023. It's been reading 1.024 - 1.025 when I get home b/c of evap.
I'm curious to see what effect, if any it has on what I put in there.
I had the tank made at an LFS. They've had 3 on display in the store for about a year now. I've been going there for about 4 months or so, so I was taking their word on how long they've had theirs.
They said that they have the same evap issue, but the slight SG change has not been an issue with anything they've put in yet, albeit, all they have are some shrooms, polyps & zoa's. One crab, one shrimp and one tank raised clown that's smaller than a dime! LOL!