The biological supplement is probably what is causing the cloudy water.
If you bought a live active supplement, which is live beneficial bacteria that feeds on fish waste and old food, it needs a food source in order to survive.
The dying beneficial bacteria will cloud the water.
Or, it could be a bacterial bloom - meaning that the biological supplement you added to the water began to die (creating a food source) and the remaining
bacteria that didn't die started producing more bacteria to compensate for the losses and is feeding off the dead bacteria.
This rapid bacterial growth causes cloudy water. But without a food source the process will continue to repeat itself.
Either way, since the bacterial issue is so complicated and confusing and already off on the wrong foot,
it will be easier and less frustrating to empty the water and start over.
Add 1 fish to the tank and follow the instructions for the recommend time and use of the biological supplement before adding more fish.
Using this product is good when fish are providing the food source and your aquarium will be cycled and ready for more fish after the process is complete.
Starting over will allow the aquarium to cycle in the steps intended. You can read about the aquarium cycle
here.
Good luck and let me know if you have any more questions.
