Had a couple of days off and cleaned the sump with vinegar, cleaned plumbing, skimmer and all other hardware. Also ordered new filter socks and replaced filters in my RODI-unit. I have been running without GFO the last couple of months since I am trying an algae scrubber instead. Not convinced yet, but I will give it a little bit more before I go back to GFO. I use ROWA, and it´s dirty stuff, I found a lot of residual GFO "dust" in my sump when cleaning. All in all things are looking pretty good considering the minimal attention my tank has been getting the last few months, I have done no water changes so far this year I think, only Balling dosing. Lost my last Parasema (the one who killed off the other three I got) because he managed to jump the tank. Now i only have the three tangs, contemplating a pair of clowns or another tank, but I´m not sure I want to add something since the system is working good.