I'm brand new to reefing. Got a small nano tank(already cycled, water tested) with live rock and one new coral(a Zoanthid I got yesterday). My tank is about 3m away from a North facing window. I close the curtains everyday, but read that direct sunlight can be good if temperatures are being checked. I left it open today and see temperatures rising to 28degrees C, it's normally 25. Should I rather keep it closed? I also see tiny bubbles rising from the rocks. My coral seem to love it.