Im about 70% through my "fish in" cycle. I have 4 danios in there that seem healthy and happy. I just did a 75% water change today because the tank was getting pretty cloudy, also I used a gravel vac on the substrate to get out any hidden debris. The tank got less cloudy after the WC but seems to be getting decently cloudy again (already). Its been hours since I changed the water and I have an airstone plus two HOB filters so circulation isnt the problem. Any ideas as to why its clouding up? Water parameters are on the nitrIte stage, was at .25 before the water change. Other than that there's no ammonia and only 5.0 nitrAte. I feed the danios every other day.