something is soaking up that dkh.......if your parameters are dropping daily and you want to keep them stable, then you will need to dose daily
......either directly to the tank or in your top up water.....just curious but, what brand of salt are you using?...... and have you tested a new batch of salt water before youve done a w/c?
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260g mixed reef, 105g sump, water blaster 7000 return, Bubble King SM 300 skimmer, Aqua Controller Jr, 4 radions, 3 Tunze 6055s,1 tunze 6065, 2 Vortech MP40s, Vortech MP20, Tunze ATO, GHL SA2 doser, 2 TLF reactors (1 carbon, 1 rowa).
http://www.canreef.com/vbulletin/showthread.php?t=50034 . Tank Video here
http://www.vimeo.com/2304609 and here
http://www.vimeo.com/16591694