Thanks everyone. She always hung out near the top of the tank at night by the skimmer, maybe she did get spooked.... My bf thinks the cat may have got her but I doubt it, he's dumb...lol. So i guess covering is personal choice?
Corals have perked up though, my brain and bubble are so much better! Tank looks good too, still lots of algae on the glass but it's not showing up on the rocks and sand. I have 9 turbo snails on the go and about 6 hermit crabs, lights having been running 5 hours a day since Friday. Cut to one feeding per day as well for the fish and I fed the corals tonight, nothing wasted.
Any thoughts on the algae?