I think it is time to invest in a Ca reactor. My complete system is approx. 180 gal. I have alot of sps so I have a pretty good Ca load. I have read through all the DIY threads here and on RC and there are just too many choices. What do you recommend? Also I am not sure if I want to invest the time to make one myself so where is a good place to buy one off the shelf. What are some features that it must have? What is good and what is bad? Does anyone have one from My Reef Creations? http://www.myreefcreations.com/castandard.htm