Yeah I think I am going to go with the aqua designs reactor
http://www.aquaticsystemsdesign.com...?model=carxnano
it is rated for 75 gallons.
or
The Schuran JetStream Pico
I can't decide when to get the reactor. Right now I have 1 large crocrea clam, 1 small crocrea clam, and about 10 1.5" mixed sps frags (Acros, birdnest, digitalia, caps,monti) I have to add calcium to my 72 gallon like once a week. So the calcium demand is low. Supply is high. But that should all change when I move my clams and my sps over to my 40 gallon.
I just would like a system that I can leave for 4 to 5 days and not worry that the calcium will get to low.
When are you going to add your calcium reactor?