MyR6Rocks
Aquarium Advice Activist
You stocked a nem too quick. Your tank parameters are not stable. Also what kind of lighting do you have on the 90? Nems in pristine water condition and high lighting, never need fed. Mu oldest nem is 7 years old and maybe gets a silver side once a month. High nitrates and maybe not enough lighting let your nem hang on for 6 months but they cant live in less than ideal water conditions long. Glad your other corals are doing good but that means nothing, corals/fish/animals all have different requirements. Just because 1 coral is doing good doesn't mean your tank is capable of supporting all corals.
Lights are led