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I agree with putting them in the shade. I lost color in my chalices when I switched to LED's. Now they are either partially shaded or all the way down.
Sometimes this could be bad. When I had the 75 gal with the larger clowns, they grabbed shrimp that I was trying to introduce into the tank and put them in the nem. :dejection: Luckily they only did it when the shrimp was in the water column. If they reached the rock, they were safe.
What I do is get freshly cut or just break it off the plug and glue it directly to the rock. I'm not a fan of having plugs on the rockwork. I think I have a total of 2 or three plugs in my rockwork and they have been there for so long that they are covered up or blend in.