Cloudy Tank Water
Hello again Aa...
If your tank hasn't been running long, then this could be the reason for the cloudy water. It can take months for the water, plants and fish to settle the tank chemistry. Bacteria can increase and decrease, plants can decay and dissolved fish wastes can all contribute to unsettled water.
You simply need to set up and follow a sound tank management routine that includes large, frequent water changes and do a good job of vacuuming the substrate where possible.
If you have a planted tank, then give the plants sufficient lighting. Most are tropical and used to long hours of daylight. Set the lights on timers. Feed sparingly, but follow a routine. Dose the ferts if you use them according to instructions.
Most tank problems happen at the beginning of the tank set up, because nothing is settled, there's no routine. Get organized with your maintainence, do things on time and give the tank time to settle.
I've used an extra HOB with a good polyfiber medium and that helps attract and hold particles in the water. You can use it until the water clears.
No need for extra and expensive bells and whistles. Stick with the basics. Fewer steps, means fewer things to remember to do and less chance for errors in tank management.
B