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So what should I do? Turn off the light? I noticed diatoms showed up today as well.The ammonia looks the same in all of these tests, the nitrate looks like it went down after the water change, and at around 10ppm it is not a problem. The pH looks better than my reef tank used to look when it was young and I was growing corals back then. So the problem you are having isn't your parameters, your starfish (Patrick?) is dying and should be frozen inside a baggy (based only upon your discription) and the goby either jumped (do you have a lid) or it buried itself hiding from the stress and commotion going on around the tank.
Post a picture of the tank, sorry this is happening but these things happen, a lot.
Calm down, and let it ride. The coral needs light and is not impacted much by ammonia, it actually will uptake that. It also wants phosphate, so feed the fish 1-3 flakes 2 times a day, aka feed very lightly and the fish will feed the coral but hopefully not pollute the tank water in excess.So what should I do? Turn off the light? I noticed diatoms showed up today as well.