Issues with Nano

[fishmanty]

Hey, got a few problems with my nano tank... its an 8gallon bowfront, 2 powerheads, 7 lbs of rock... 1 clownfish, and 1 yellowtail damsel..

In the past 2 days, all my corals have been closing up, and my water is getting a bit murky.. what can I do to clean it up a bit?

O, plus my gf had a nudibranch in there and it died shortly before the tank went downhill..

Any idea what is going on?


Thanks
Ty