I think you button polyps will be fine with a mantis - especially given that they spread like crazy once they get happy. Button polyps btw come in several different colors and flavors. They are a protopalythoa and respond well to feeding - mine like mysis shrimp. Personally I would raise those lights another six inches up, air isn't going to effect your par, but it will effect the amount of heat you are generating in that tank. Just my $.02 worth