So before I get the tank moved into its final resting spot I was researching easy to keep corals-hammers, toadstools, frogspawns and zoas. This last one got me a little worried after reading a post on the high end zoas. They were suggesting kh and cal levels. The reason I don't want sps is because the tank will only be getting monthly or biweekly water changes once it is in place. So my question is are the high end zoas really that hard to keep? I've kept kedd reds, lunar eclipses and whatnot without problems but if I remember correctly this was on a post about black hornets. I just don't see why a softie would need cal.