coral closed

My 16 gallon reef has been stable for the longest time, until I got bubble algae and started to increased my water changes which got to a point where my nutrients were too low and now I have dinos. I had dinos about three weeks before I decided to do a blackout and all of my coral was fine, but...

So I've had this pink Goniopora for about 2 and a half months now. It had great polyp extension during the day for the first month and a half, being fully open when lights were on and closing when they went off. Then one day suddenly it decided it wanted to be fully closed during the day, and...

I bought this coral a few weeks ago sorry i cant remember the name of it all i know is that it was a pretty big soft coral the past 2-3 days it hasnt come out much at all my tests came back fine salinity was fine only issue was the mag was a touch high but i doubt that would've done anything...

all the zoanthid polyps are closed on my zoanthid frag. Other animals include a blastomussa frag, a citron goby, a margarita snail, a Mexican turbo snail, and three nassarius snails. The blastomussa is fine. Here are my parameters: Nitrate: 20 ppm Nitrite: 0 ppm pH: 8.0 KH: 180 ppm GH: 180 ppm...