"Soap Bubble" Processing Help

I admit my processing skills are not the best but I've always managed to do ok but I can't figure this one out.

I decided to try for a really difficult and faint object so I choose the "Soap Bubble" through an Ha filter. Scope is a C11 used at around f/11.5 with an ST-8XME. Subs were 30 minutes and I stacked 8. Using CCDStack v2. When stretching the image, I was pleased to see "The Bubble" but then noticed all kinds of "black dots" on the image. What are these and how do you remove them?

Thanks

Chris N
Cedar, MN

Attached Image:

I think... they are hot pixels from a dark frame that didn't have the same temp as the light frame and thus show up as dark pixels when subtracted out. I get them all the time and find it frustrating.

Joe

I think... they are hot pixels from a dark frame that didn't have the same temp as the light frame and thus show up as dark pixels when subtracted out. I get them all the time and find it frustrating.

Joe

What calibration frames did you use?