Alright, month of October my tank went to poop. Was gone 3 weeks in Oct and the person watching the tank did what they could for the system which wasn't much. I treated Boyds for cyano and the cyano disapeared along with the growth on the scrubber. I mean scrubber went from thick green growth to bone white. My magnesium was undetectable so have been dosing Ca since. I recently replaced T5's with a Hydra LED system but before that, been noticing a ton of recession in pretty much all of my corals. Probably due to lack of Ca. Tank was running beautifully with minor cyano before vacation. Been running scrubber only for over a year now. System is a 36gal Elos Midi with 1st gen L2 scrubber and have been feeding about 2 cubes a day. Lights on for 9hrs. API test kit as of this morning PH 8.2 KH 9/161.1 Nitrate 5ppm Phos 0-.25 Mag unreadable (salifer test kit) Calcium undetectable and dosing tropic marine one scoop every other day starting in november Salinity 1.026 Also been noticing a lot of dirtitus in the sump. Placed a mesh bag of 2Tbls of carbon in the sump and corals started to recess further. Thinking of skimming on top of the scrubber. Thoughts? Turbo I believe you have been experimenting or running a skimmer along side the scrubber. Was wondering on cycles between running each. Pics Screen after 2 days 9hr cycle FTS: cloudy water as I stirrup up the sandbed a bit Lobe dying Hammer all but dead Also for the Hydra I'm running all blues, violets and UV at 35%, Whites at 20% and Red and Green at 10% which was recommended. Corals initially opened happily to the new lights at the t5's needed changing but again have pooped the bed. Getting really frustrated.