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Pretty hard to say without a pic, but if it's hard to get off it's probably coralline algae. If you want to remove it, soak the decorations in vinegar. It will dissolve the coralline.
ok ill try vineger.i have a regular floresent bulb emperor filter and i have a blenny ,two clowns and just bought a long nose hawkfish.i always have great parimeters my salinity is alittle low at o.22 but the company says to keep it between 0.20-0-23