Hello everyone. Long story short, I have a few corals in my tank that are not opening anymore. I have had everything tested from the water to the lighting. I'm starting to think something in the tank is picking on a select few (have all refs friendly fish) I was wondering if anyone had any ideas just for an experiment if there was something I could put over one if the corals and still let the light and water in but keep something from picking at it. I tried a clear cup but can seem to get it to stay. I don't have another tank or anywhere to move them. I figured you guys alway have some really creative ways of doing things. Thankd

