Great job researching before you got the pet. Most times it’s the other way around. Cloudy water can be caused by not rinsing new substrate or filter media before it’s added to the tank?

This comment was from 2016, but I do appreciate your advice and care to another person who was in need.

Hi,
He needs a heater ASAP. How big is his tank? The size of the tank determines the strength of the heater – so the water doesn’t get too hot. For a small 1 gallon tank you have to get a weak heater like Hydor 7.5 Watt, for 2.5 gallons, you can get a 10W one, like Aqueon Mini Heater.
They cost less than $10 each. It should be plugged in at all times. The filter and the light should go on and off, but the heater has to be on at all times, unless the temperature is over 85 degrees. You need a thermometer, as well, there are always inexpensive choices. Please get this at the pet store for him ASAP, or he will likely die. If cost is an issue, I will gladly PayPal you the amount you spend on his heater. Feed him sparingly while he’s cold, because his metabolism is very slow right now. Good luck to you both. Please update us, if you have a moment.
Thank you,
Theresa:)

Hi Raven, that’s awesome you saved up your money to get a betta! You don’t want to leave the betta anywhere in direct sunlight as it can heat up the tank too quickly and also cause green algae growth. You will need a 2.5-gallon or larger tank with a lid/cover. A built-in thermostat heater. Water conditioning drops. Some betta fish pellets. Silk plants, non-sharp decor, and some gravel for the bottom. Feeding is 2-3 pellets, 1-2 times per day. Cleaning will depend on the size of the tank, but partial water changes ~25% with new conditioned water a couple times a week are very important to keep clean water coming in.

Ranjan it’s hard for me to give you an answer based on limited information and not experiencing it myself. A change in color, getting more vibrant for example, is no reason for alarm. Dulling colors or loss of color however indicates stress. The only thing I could guess on is all of the things you did in a short period of time may have caused additional stress. Bettas do not tolerate abrupt changes in water or water temperature well.

Once you go to choose, you’ll know. As with most of Mother Natures creatures, males are more pleasing to the eye and the type of Betta is more obvious. So many options,only one choice.Do you know your type?;)

I fed my Betta last night. There was no symptoms or signs of any abnormality. His color was vibrant royal blue. In the morning I noticed his color was like metallic sky blue, the red stripes all gone. I immediately changed the water, treated him with salt solution and then put him back to his home with antibacterial drops. And in a few hours later he’s dead. I’m clueless and very sad. Can you please tell me what might be the reason