lol, I used that exact same example in my debate...
Well, here's the first round of parameters and pics:
It had been about 10 days since the last water change. I do not dose anything. Immediately before the water change:
dKh: 6.4 (this is much lower than I was expecting!)
Calcium: 340ppm (also, Much to low!)
Magnesium: about 1300ppm
Temp: 24.8
Ammonia: undetectable
Nitrite: Undetectable
Nitrate: didn't test
Phosphate: didn't test
Here's the tank before the water change
I won't put detail shots of all the corals, but note how much the colours in the two brains have improved compared to earlier images in this thread:
Also note that the christmas favia (I think) has noticeably started plating polyps on to the rock:
The ricordia has about 3 mouths, I'm waiting for it to split, and I had mangled that blasto fragging to the point where I didn't think it would survive. It had one intact head, and 2 heads that were just chunks of torn flesh. It's recovered nicely.
The last of those pics was taken at 1:02pm, I shut everything off and started draining immediately
Here's it empty:

and I drained it completely, also exposing the ceramic borings
Those pics were taken at 1:09, right before I went in the garage to get the new water, so the tank was empty for 7-10 minutes.
Here's the tank immediately after the water change
