Air carrier Captain reported the First Officer flying a nighttime Visual Approach was unstable and received a low altitude warning from ATC.

Narrative

During the approach to landing; at night; ZZZ approached cleared us for a Visual Approach to Runway XX; while in a left downwind. FO and I discussed how he would execute the Visual Approach; we talked about not exceeding 5 miles from the end of runway XX. The base turn was approximately 4 miles; just at the Final Approach Fix; we started configuring on the base leg and were fully configured before turning onto final. The glide slope was alive and showing us high on the glide slope. The PF put us in a shallow descent to recapture the glide slope. We were a little off course from the final when we received an ATC notice about altitude. We had visual with the ground and runway but PF disconnected the AP (Autopilot) leveled off and increased power even though the glide slope was showing us high. Once we leveled off and were on course to final approach the glide path came back in and showed us low on the approach. We were in VMC and were able to get back on glide path prior to the 500 ft call out. We were completely configured prior to 1000Cause: Turning base leg too close to the runway and getting below the glide path. Suggestion: Next time ensure you're briefing how you would fly a visual approach at night. The FAF is only 4 miles from the runway; would recommend capturing the localizer 1 mile outside the FAF. If uncomfortable with the approach at night; I would recommend just flying the published ILS.