Must a married woman cover her hair while niddah in front of her husband if she usually doesn’t the rest of the month when alone with him?

Shalom, Some hold that a married woman must cover her hair at home when she is niddah, but some hold that just at home she need not cover her hair since he is used to her hair being uncovered. Therefore if possible it is good for her to cover her hair but in cases of need she can be lenient. Kol Tuv