I've been trying to work through some pretty bad algae problems. I'm seeing green algae on the rocks, brown algae on the sand, more than ideal amounts of bubble algae, and stringy brown algae on the glass and back wall.
I've cut back feedings to every other day, I'm running my skimmer 24/7, and I'm running about 1/2 cup of GFO in a filter bag. Last time I tested phosphate it was at 0.05 ppm, nitrate was at 0.2 ppm.
I'm in the process now of trying to eliminate variables and keeping up with the husbandry. I started up my automatic water changing system about 3 weeks ago. I'm changing out 1 gallon per day. Ironically, the brown stringy algae seemed to get worse after I started up the system. This lead me to a deep dive on RODI systems and I realized how little I know about these things. It turned on my DI resin was completely exhausted (I bought the RODI system 4 years ago). Even so I was producing 0 TDS water. I've replaced the sediment filter, carbon block, and DI resin. I'm hoping this is the problem, but I don't know yet.
Interested to hear if anyone has any tips. This is a bummer. I'm trying to sort this out so I can experiment more with coral foods, etc, as most of my SPS are brown. I'm running the system very simply right now, just keeping the big 3 stable and feeding the fish.