Accidentally merged iCloud Photos with husband

It will only sync within an Apple ID, but it can be tricky if you change Apple IDs.

I would recommend that you both run a full backup on both your accounts, just to be save ;-)

Please ensure that you are signed in with the correct Apple ID and delete a few photos.

Then wait 24 hours and check if it has deleted them only from your account.

If something goes wrong you can restore them from "Recently Deleted Folder".

As soon as you have done the test it should be save to delete all photos.

Ralf

Be very, very careful, before you delete photos from your iPhone. The backup of your iPhone does not include any photos that are stored in iCloud Photos. Any photo you delete will be gone.

If you have a computer, download all your photos from the iCloud web pages at www.icloud.com from your husband's Apple ID and from your AppleID, to save them somewhere, before you proceed to separat your photos again.

Do not delete any of your husband's photos, while you are signed into his APpleID.

Only after switching to your own AppleID.

You are concerned about memory on your iPhone-- Do you have "Optimize iPhone Storage" checked in Settings>Photos? That would keep smaller versions of the pictures in your phone while the full-sized ones are still stored in iCloud.