Hi fellow reefers, I have a problem. During my 4th day of cycling, my tank have massive die off. The bristleworms, hitchhiker crab, some wierd looking prawns n pods are all died on my sandbed. Test result ammonia 0.3 N nitrite 5ppm. Today's the 5th day and water became cloudy. A check on water and shown ammonia 5ppm and nitrite 10ppm! There are no fishes inside. Should I do a water change or let it recover by itself?