You won't need the calc reactor until a good several months down the road, after you've gone through the tank break-in period, the initial stocking, the stabilization period, and then finally have a regularized load of growing corals that start to demand more calcium than regular water changes can meet, i.e. don't add it until your weekly calcium test readings show a prolonged period of decrease.
They can be finicky to get dialed in and require a stable amount of demand from your tank's inhabitants, but after that learning curve is mastered you'll be glad of it, as few other methods can meet calcium demands as well and as consistently.
Dave.M
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My Gawd! It's full of corals!
Current Tank Info: None. Nil. Zip. Nada.
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