Several problems here. Are you aware of the nitrogen cycle? You should never throw your sponges out as they contain your good bacteria. If you didn’t cycle your tank first, then you will need to do daily water changes to prevent fish from being poisoned. Read this https://www.fishforums.net/threads/cycling-your-new-fresh-water-tank-read-this-first.421488/
Your tank is too small. A single tail goldfish will grow up to a foot and needs a 100 gallon tank. The fancy goldfish needs 20 gallons. Everyone makes these mistakes. Read up on how to cycle your tank. That’s the most important thing right now.
Just because your fish are @alive” now doesn’t mean your tank is cycled. What are your water parameters?Hi Deanasue, my fishes are alive, that means that I know the nitrogen cycle and cycled my aquarium The bacterias in my tank stay under the biological bottom filter too I also use to do Partial Water Changes to reset water parameters like ammonia and nitrate... and I did that... But I'm having the same problem. I took seventy percent of the water...
Hi Deanasue, I cycled my aquarium by using a biological accelerator and not using a pump, I didn't do any test (ammonia, nitrite, nitrate) because I don't have them (waste of money).Just because your fish are @alive” now doesn’t mean your tank is cycled. What are your water parameters?
As @Colin_T mentioned, cloudy water is most often a simple bacteria bloom resulting from excess organics in the water. They will most often clear in a day or two, so the answer is patience...but the tank maintenance and reduced feeding advice previously given is sound.
I don't like commercial clarify products that bind smaller particles so they are more easily filtered out. These are hard on fish gills, and do little for a bacterial bloom.
Btw, what is that substrate?
"If it’s a bacteria bloom, the simple answer is patience. Although it may look bad, the cloudy water typically isn’t harmful to the fish. In time, the water will clear on it’s own as bacterial populations settle down and a balance returns in the tank eco system."