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They are starving 100%. Even if you test that menial amount of nutrients it doesnt mean that they couldn't be completely bottomed out at another time of the day. If you run ULNS, its a chess game of elevating nutrients to your uptake from your corals and keeping that stable, but its a lot of work to run UNLS and you need a very very good understanding of nutrient uptake on your selected stock of coral. Iodine is also a very important trace element that you need to get in check. You are really close to being successful but the small things are what it takes to have a great system. Raise your nutrients, if you need more fish than get more fish or dose phos and nitrate, level it off and try again with some cheap montis.