If you really want your GSMs to be happy, get them a BTA. E. quadricolor is their natural host, and from my experience with two maroons, they go the that species of anemone in short order. If your pair of maroons are large, then you will want to try to find a large anemone, or keep the fish away from the anemone until you've grown it out to at least double the width of the fishes length.