Anna has asked me to assist since she was not feeling well. I would like to first address water quality. It is important for the Ammonia to be at 0, Nitrites 0 and Nitrates at less than 20 ppm. Water quality can play a part in the health of your Betta. Adding the chemicals to the water can further disrupt the water quality.
I suggest doing a partial water change and add some type of filtration to the tank. I also suggest adding 1/8 teaspoon full of aquarium salt to the water (usual is 1 teaspoon full per gallon of water). This will help with the swim bladder that, which is the organ in a fish's body that helps with buoyancy and being able to swim normally, as well as it reduces stress and adds a protective slime to the fish.
I alos want to let you know the color loss you are seeing may be a part of the aging process in the fish. Their life span is not as long as a gold fish or other species and as a Betta ages they do loos some color. When you purchased the fish there was no way to know its age, so it may be much older than the 15 months you have had it.
Hopefully with these measures, we can give your Betta some more quality of life and get it feeling better. Joan
The life span of a Betta is 2-3 years and the average is about two years under the best conditions. If we can get the conditions correct for the betta we have a better chance on improving the life span. The problem is when a Betta is purchased they are already adults, so we do not know how old the Betta was when when you got it.
As far as water changes, the reason we do not do a full water change is there is a problem known as New Tank Syndrome, which is where it is like starting a biological filter over again. A fish needs a biological filter in the tank which helps with Ammonia, Nitrites and Nitrates. If you continue to do full water changes you are removing the biological filter.
I have a suggestion that may help. Walmart has a set up with filtration, light, and pump which would work well for the Betta that sells for $19.99. The pictire below is not great but it is one of my Bettas in a tank like I am telling you about. You can use the current water that the Betta is in and just add some bottled spring water or some trated water. This will help the water quality. The Ammonia needs to be 0, nitrites 0 and the Nitrates 20ppm or less. This would be the cheapest way to give the fish a good chance at living a longer life. Joan
I use Betta Bites too and feed two pellets in the am and 2 in the evening. The tank a 1 1/2 gallon tank and it comes with everything except the gravel. Make sure you use the current water, which has a biological filter established and add some treated water or as I use bottled Spring water. I do a partial water change every 3-4 weeks, as long as the water quality is good and if it gets cloudy I do an immediate change. Water quality has great bearing on the health of the fish. Most of the issues we see with fish, are caused by the water quality being poor. Joan
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