SPS question

[niloc16]

i have NEVER dosed iodine, maybe its something i should look into. my carbon is in a filter sock but all water through the sump is forced through it. actually i have never dosed anything aside from using rowaphos. the only thing that has changed in the last month or so is switching to seachem reef salt. ca and alk was a lot better in this salt over IO. i honestly dont know why i ever leave IO, ive never had problems with it and the 2 times i tried different salts something happens. initially i was getting really good results from the seachem but maybe in the end, this is the problem