Anyone I.d. what's on my clown?

[ljblmyrt]

The last couple days I lost my Angel and my Dotty back. Now my clown looks like this and my tang is not acting himself. Have not added anything new at all for at least two years, not even a snail because of a fluke outbreak in the tank. Are they back or is this something else? Temps in tank have been off due to freezing cold weather outside. Thanks for any help.

 

[ljblmyrt]

sorry this is a duplicate for some reason. Operator issues I guess I must have submitted twice by accident.

 

[Humblefish]

I can't tell much from the photo. How much is your temperature swinging?