Adding RO top off water will not affect alkalinity. There are basically two ways to reduce alkalinity. One way is to wait for the organisms in your tank to consume it (coraline, sps, clams, lps, and other calcaerous skeleton building creatures) and the other way is through precipitation which is basically what you are doing by adding calcium. Water can only hold so many dissolved solids. Adding only calcium will force out some of the alk. Caution should be taken though as doing this too fast will cause too much precipitation. Are you adding all 5 gallons of top off water at the same time? Top off should be added daily to reduce the swing in salinity. Dripping top off water is best but not necessary, although small frequent amounts are much better than large amounts every few days. I usually add half of my top off water in the morning and half in the evening.
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