I agree that a Ca reactor is the ultimate way to go, but the up front equipment cost is high compared to using Kalk. As you are just starting out, your tank won't be consuming too much Ca/Alk at first. The number one rule is that you have to measure your Ca/Alk to ensure that you are only adding what is truly needed.
I think the order of succession goes...
1) Start with 2 part additives. These don't cost much because you won't need much. Some are sold dry, others are liquids.
2) As Ca/Alk needs increase, you'll find it harder and more expensive to maintain levels with the 2 parts and migrate to Kalk. (you can drip it in, or use a Kalk reactor) Kalk reactors sort of save you the time&trouble of mixing batches of Kalk.
3) Eventually, Kalk might become inadequate to the need, or be too time consuming and you'll want something stronger and less fussy...Calcium reactor.
For me, I have a 30 gallon with a 175W MH and I grow a fair number of SPS, coraline and a clam...and am still a long way from reaching the limit of Kalk. It looks like my tank may never use enough Ca/Alk to warrant a Ca reactor, and I've got a good Kalk system that I don't find to be much trouble at all.
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