Cloudy tank
 

Yesterday morning I decided to do a thorough check of my parameters because I figured there has to be a reason my leather coral looks limp and opens and closes 3-4 times a day. Everything checked out except the ammonia which was at 0.2. (probably from a piece of banana I left in for too long but my tang loves it) I did a 15% water change and sucked up as much debris as I could find, there wasn’t that much but some. Anyways I got up this morning to a cloudy tank. What can I do?
The setup is 6 weeks old. I added my first fish (damsel and a cleaner shrimp 3 ½ weeks ago.
Parameters:
Ph 8.3
Alk. 4.5
Sg 1.024
Cal. 400
Phos. 0.1
Nitrite 0
Nitrate 0
Silicate 0
Amm. 0.00
Ammonia this morning is 0 but 3 tiny dots of green on the yellow disc. I also did a reference test so the test is fine.
HELP!!!
Louise