Yes, 15dkh is too high and you should fix it...slowly You're overdosing on Ca/Alk. Shut off your Ca reactor and Kalk and monitor the alk daily. It will come down.
Shutting off the Ca reactor means stopping the flow through it completely. If you just reduce the flow, you might actually INCREASE the output of the reactor. Restart it once the tank Alk is down to 9 or so. Then check the alk the next day to see that it is staying at that level.
If the alk starts to rise again, you'll have to dial back that Ca reactor. Run it at higher pH.
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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