So I recently got this betta fish almost 2 years ago as you can see in the first photo he was very healthy and his fins very bright and colorful. Recently I’ve noticed he’s starting to lose his color a little and his fins have started to deteriorate. I’m not sure if this is from fin biting or fin rot. I’ve tested the levels in his tank and they all are good for him and I do weekly tank changes. He also has a heater, a filter, and I just added aquarium salt and some bettafix as well but so far I’m not seeing any progress and I’m not sure what to do about it. He seems happy and he’s like his normal self, I have a 3 gallon tank but I’m not sure what to do and I don’t want to lose him. Also nothing in the tank in plastic, all silk plants.