Ruling out new water as a source i re read your original post.
I am not familiar with your skimmer.
How big is the cup? A full cup everyday sounds like a lot for the amount and size of your fish.
How many cubes are you feeding twice a day? Do you shut your pumps off so its not building in the sump?
Do you have any shrimp or hermits in the sump where they wont get sucked into a pump?
How was the live rock dried and cleaned?
My skimmer cup full holds, Im guessing 16-20 oz
I bought the BIG flat of PE mysis so I break off and feed. Id say maybe 3/4 of a cube per feeding or 1 1/2 cubes per day total. And again defrosting then feeding just shrimp no liquid from cup goes into tank.
Yep I shut down, system runs off an apex, so complete shut down for feed 5 mins except for MP40 that drops to 15% nutrient mode
I have it wet skimming to try to stay on top of phos. It is pretty clear, and I watch my salinity to make sure that doesn't move.
My CUC
one scarlett skunk cleaner shrimp from a mature tank, he's probably 4-5 inches
2 red legged hermits
1 diamond goby (sand sifter) 4+ inches
2 narcissus snail,
10 or so trochus snails,
I do not have anything in in the sump for CUC, just socks, skimmer and fuge
Hanna checker is Phosphate
Green HI713
