What you use atm?I found that i would have constant levels be dosing the same amount feeding the same amount, then one series of tests id have nutrient overload, id increase the dose by 5% then id have so little nutrients my lps and softies were shriveling. One month id seem to have a surplus of nitrate the next phosphate.
I was given 5l of the stuff when it first came out and gave it a run for about two years and never in that time felt had that security to set and forget with it.