ya, it was tough finding info about this, because it's not really common - lucky me, I always get the funny problems in my tank... :-/ I feed twice a day (mornings & late afternoons), with a pinch or two of flake, and a measured amount of PE Mysis, and Spirulina enriched brine. I'll also occasionally drop in 1/4 sheet of algae for my tang and blenny, and a clam halfshell for the Copperband and wrasses. I have actually started (as an experiment) dosing PO4. I'm about week in with 1mm per day, but results are somewhat inconclusive so far. I figured at the rate of 1mm per day, it would take 1 to 2 weeks to start seeing some results (good or bad). Once I have something to show, I'll post a thread about it.