I have a mix tank. Zoos, Toadstool, Leathers, few LPS, and few frags of SPS. I'm going towards SPS... I have a DIY kalkreator for topoff that also keeps my calcium at 430-450 range. Should I get a calcium reactor now or should I not? If I do need it, can I get a complete set of calcium reactor for under $400 bucks? Is there such a thing for under $400 bucks?