I recently found out about this site and decided to register because some white string-like stuff has been attaching to my bettas. It started less than a week ago with my crowntail when I noticed a white fuzz surrounding some of the ends of a couple of his caudal fin (like a tube). But there has been no change in behavior, he was busy building up he usual large bubble nest until I moved him to QT today. Now my other betta (also in QT) has a white string attached to his body, although he already most of it off so it doesn't seem as tightly attached. I have also noticed white stringy bits in both their waters.
Based on my limited knowledge (google) it isn't external parasites - not the right look, no behavior change and no movement of the white stuff in the water. I believe it is either fungus (but on the fin?), poop, algae, or maybe it can be blamed on their white gravel. Algae seems most likely because both bettas recently got live plants (for the first time and from the same reputable local store), but I just don't know and it is really starting to concern me. Also, I recently put driftwood in the crowntail's tank that accumulated some white algae/fuzz spots (note that the driftwood was brushed, boiled, and soaked before it went in the tank).
(each betta has their own identical tank)
What size is your tank? 3 gallon (now 1 gallon QTs)
What temperature is your tank? about 80
Does your tank have a filter? yes (but today I moved them to separate QTs without)
Does your tank have an air stone or other type of aeration? no
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? freeze dried bloodworms and pellets
How often do you feed your betta fish? twice a day
How often do you perform a water change? once a week
What percentage of the water do you change when you perform a water change? about 40 percent
What type of additives do you add to the water when you perform a water change? conditioner (tetra aqua safe plus or seachem prime)
Have you tested your water? If so, what are the following parameters? yes, two days ago the readings were as follows:
Nitrate: One tank (crowntail) was almost at zero, the other was at 5 ppm
Symptoms and Treatment
How has your betta fish's appearance changed? see above
How has your betta fish's behavior changed? No
When did you start noticing the symptoms? almost a week ago
Have you started treating your fish? If so, how? no
Does your fish have any history of being ill? N/A
How old is your fish (approximately)? They are each about 1 year
Also, it is possible for a betta to have ragged fins but no fin rot? My second has ragged fins but I have had him for several months and he has always looked this way. Wouldn't fin rot get worse? While I am dealing with diseases I would like to rule this out as well. If I figure out how to I will post a picture.