I'm just curios about my phosphate levels, im currently using gfo to try to keep my phosphates down, usualy they are around .20-.30 using gfo it drops down to .05-.08 over 24 hours. if i let it go over 2 weeks it will be back up in .15 range. im still learning my system to keep my phosphates under control, but im just worried about my sps- acros as far as not stressing them out by this phosphate deal. so my question is is dropping that much (from .15 to .07 in 24 hours) consider a stress to corals?