Remove some of the fish! Too many in that size tank in my opinion!
Nitrates are too high due to insufficient filtration as well as excess nutrients in your water caused by feeding as well as dissolved organics and inorganics and phosphates.
How are your pH and alkalinity levels?
I also think that you added way too many fish over such a short period of time, hence the bacteria level is not up to speed and population to handle the large bioload in my opinion!
Personally, I would return a few fish to your pet shop atleast initially for your tanks water parameter levels to level out at the optimal zone! _________ 125gal.w/Mag9.5 return(dual megaflow)>Mag7 pump Aqua Cev180skimmer.Wave2k Hamilton Reefstar(2)250watthqi(mh)pend.a Yellow, Naso Tang Red Lip Blenny Percula Clown Demoiselles Niger Trigger F. Wrasses Ceriantharia Orn.Shrimp and Stars Hermits Queen Conch asst. snails> Stars Zoos shrooms Montipora Brains Gorgonians Favia Turbinaria(large+small polyp) Acropora Xenia Tridacna (CroceaMaximaSquamosa) Leathers <35+75gal.reef tank as well> 
"IF THE PHONE DOESN'T RING...IT'S ME"  jb  |