Nitrates are at 10 or 20

[BKT]

I've added the sump, working properly so far...the only thing that I did wrong and am worried about is a change in water temp. I added 10 gallons to the sump and the new water brought the temp from 79 to 76. My colt coral has drawn in and is deep purple...my chalice is dark colored and the torch coral has drawn in and turned green from brown.

Did I screw this up bad?

[GaryP]

Did I screw this up bad?

Probably not. In the future when you are doing a water change, or whatever, just add the water slowly and circulate. Of course its better to have the water at the same temp. In my setup its hard to do it that way without a trash can of water sitting in the middle of the living room. The wife gets a little upset when I do that.