Does your aquarium look like someone poured milk in it? Cloudy aquarium water has several causes. Fixing the problem can be simple, but it it can also be a multi-stage process.
There can be many causes for cloudy aquarium water. Below we will look as some of the root causes and how you can fix them. Be aware that often this problem goes along with other problems, such as Ammonia Spikes. Fixing this issue is important to keeping your fish healthy.
If your water becomes cloudy just after you added gravel substrate and filled your tank, then you may have gravel dust in the water. This condition could cause your fish some problems.
If cloudy aquarium water occurs quickly after you first fill your fish tank or right after you do a large water change, then you could have dissolved minerals in your tap water. Water testing may also indicate high pH levels, but this is not always the case.
Bacterial blooms can happen in new and established aquariums. If cloudy water occurs a few days or a couple weeks after you first fill your tank or do a large water change, then bacteria may have attached to dissolved biological matter in your water. This dissolved matter rots and creates ammonia that your helpful bacteria love. Bacterial growth explodes in your aquarium water and it becomes cloudy.
Taking the tiny bits of biological matter out of your water can be a fairly slow process. It may take several days for this problem to be resolved. If cloudy aquarium water continues to be a problem, you may have gotten into a situation where you have to treat your aquarium for an Ammonia Spike.