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Help?! I dont know much about my fish...

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I have 13 Convict cichlids (zebra cichlid) and they're about 11 months. I went on a trip (I had 23 cichlids) and when I came back my friend told me 10 of them died.She didn't know why, but she still saved the 13. So when I got home I cleaned their tank again,but I noticed the water started to get cloudy in less than 3 hours. So then I moved them to another tank, but then the next day the water was cloudy again. Whats going on? the fish have suddenly gotten over protective over the rocks , and lately the fish have been swimming in circles at the top of the water.