You need a heater. Ceramic heat emitters, radiant heat panels, radiators - there are lots of choices depending on your setup.
I'm currently using a CHE and a 65W flood light until my MVB comes, and then I'll swap that out with the flood light.
65 Watt is probably not enough. How many Watts does your MVB have? And how big is Your enclosure? In my 1x2 meters enclosure I have two lightning fixture: first a heat source 100 Watt and second UVB/heat bulb MVB 125 Watt. If nights get cold I use 75 Watt CHE.I'm currently using a CHE and a 65W flood light until my MVB comes, and then I'll swap that out with the flood light.