There are no fish in the tank, but I will turn of the light more.It is not unusual for a new tank in become cloudy for a few days. It is a bacteria bloom that occurs and when the bacteria is done it will clear up as @ClownLurch correctly stated. If you are getting an algae bloom (green) that means you have too much light and/or too much nutrients in the water or both. If you cut back on the amount of light-intensity or time and cut back on the amount of fertilizer or food you feed you fish this will help along with weekly large water changes of 50% or more.
Hi, there is no sand in it. It's special ground with ar the plants, the shop where I bought it and bag says you don't need to wash it. Do you know if it is because the airflow is running?Hello good evening and welcome.
Did you rinse your sand thoroughly?
I did my small tank last week with sand that had been rinsed three months ago then rinsed again prior to going into tank. It was perfectly clear for a day then went cloudy over night. It took another two days to clear up.
Best of luck.