I think you should be ok. Just let them have whatever light you have until then. You got a decent fixture so things should spring right back quickly after you get the light. The nem, I'm sorry but I just don't know. In my opinion I think he will make it a week but it could be he doesn't. Can you let him visit with a friend til your lights come?
180g Reef - 60g Rimless Reef -90G FOWLR- 125g Malawi Cichlids- 40b REEF- 34g Fresh Planted-working on- 20L FOWLR- working on
I have a mix of many different saltwater fish amongst my tanks, but I love my Tangs most of all.