colour change

Pictured below is my male betta in the store (20 December 19) followed by his first days in his new home. He instantly became much more vibrant which I was very happy about. However he then developed a dark spot by his lip - starting off as a small grey dot. He was also glass surfing for...

I have only had my Betta a week now and he was at first pinky purple and now he has change colour -more purple. The first 2 pictures are of the betta at the fish shop just before I got him. The next 2 pictures are today. Would too much light cause this?? Should I be worried? Usually he has...

about 4 days ago I moved my fish in my 38L tank to my new 90L tank, while I was catching my yellow Molly named Frazzle in the net, her tail started changing colour, the next day I noticed her tail, dorsal and anal fin were transparent and when i turn the blue light on the top of her head is also...

Hello!    I've got a red veiltail betta, I've had him for a couple of months now in a tank of about 5 gallons. He seems to be happy and healthy, although he's currently recovering from fin rot.    I noticed a while ago that the tips of his ventral fins had gained a pale electric-ish blue...