My tank was doing perfect in my 90 gallon with 30 gallon sump . My dad went to the keys and brought me back some fish and a live rock the live rock was with 3 good sized cowfish and lobster that all died and I put the rock in the tank thinking it be fine the next day my whole tank is super cloudy! And can barely see I just did a big water change and water tested ammonia looks barely over 0 if that. Nitrite is at least 5.0 ppm off the charts and nitrates at least 40 ppm and that test was after about a 35 gallon water change what should I do I'm not aure anythings alive I found some alive am some dead what I can see please help!

