I started a tank yest (60g) using biomax from another established tank and 20g worth of water from an established tank. Now, I rushed into it by putting in 40lbs of tahitian sand that was cleaned 10min/10lb. However, the tank is still dark and foggy from the sand and I was wondering if it would be safe to do a 50% water change or not. Before I put in the 20g, I did fill the tank all the way to do a 80% water change. Right now theres a 4" jardini in it.