My celophane betta fish, Eros, has a slowly spreading black colouration creeping around the edges of his scales. It's been about 2 weeks since the first grey-ish tint appeared, and I noticed today that he's also begun to display small dark brown-to-black pin prick specs on his forehead, between his eyes. Because of his colouration, I am having difficulty determining what the illness might be. Most of the pictures available on the internet are of brightly pigmented bettas, not celophane.
Initially I believed that the black mark was from him brushing up against some of the new decorations I had purchased for his tank, but now I am concerned that they may have been returned items that previously lived in an infected tank. Luckily he still seems to be in good spirits -- very active and still hungry.
I've removed him from his 5 galon tank and placed him in a 1 galon, undecorated bowl with no substrate to thuroughly clean his old tank, get photos and begin treatment, but I'm not sure what route to take. Any help the community could provide would be greatly
appreciated by both of us.
What size is your tank? 5 US gal
What temperature is your tank? 78*
Does your tank have a filter? yes
Does your tank have an air stone or other type of aeration? yes
Is your tank heated? yes
What tank mates does your betta fish live with? none
What type of food do you feed your betta fish? Hikari "Betta Bio-Gold" pellets
How often do you feed your betta fish? daily, 6 days on 1 day fast
How often do you perform a water change? 2x weekly
What percentage of the water do you change when you perform a water change? 50% and 100% changes, respectively
What type of additives do you add to the water when you perform a water change? "Water Conditioner" by Sera
Symptoms and Treatment
How has your betta fish's appearance changed? Black colouration spreading around edges of scales, small black dots recently appeared on forehead
How has your betta fish's behavior changed? Still very active and alert. Still eating well.
When did you start noticing the symptoms? ~2 weeks ago
Have you started treating your fish? If so, how? Removed from large tank
Does your fish have any history of being ill? No
How old is your fish (approximately)? I bought him 2 months ago. Not sure of his age.