Fungal infections can take hold any time there is damage to a betta's slime coat. An affected fish looks as though it's wearing cotton.
That’s good, any progress is good! It could be fungus (columnaris?), and velvet but please make certain you think it is before medicating for it. See the photos on this page and how to identify and treat it in the chart above. As for tank size, yes a minimum of 3 gallons with recommended 5 gallons is required for a healthy and happy betta fish.
Bryan, the ich is now fully gone and he is back to eating regularily, however there is still the (almost like dead skin) hanging off parts of him its very sheer, could be fungus? Also My betta has some bronzish coloring on his head and the beggining of its tail and its stomach. SOmeone said it might be velvet! How would I go about treating the maybe fungus, and maybe velvet! My fish still looks sick bcs its not moving much and its still staying at the top of the bowl. Also would you recomend switching to a bigger tank, mine’s at 1 gallon.
Common fungal diseases in betta fish
Fungus Sick Betta Fish | Fish Care
Though Betta fish are known for being hardy very easy to care for fish, this does not mean that they are not prone to any diseases, however. All fish are highly susceptible to fungal infections and the Betta fish is no exception. This is one of the most common "ailments" that those with Betta fish will encounter while owning a Betta fish. There are a number of things that can be done with regard to prevention and treating the common fungal infection Bettas are prone to, as well as some easy rules of thumb to ensure that you are correctly identifying the infection.Good tank "hygiene" is the easiest way to reduce your Bettas susceptibility to fungal infections. The mostcommon cause of these infections to begin with is poor quality tank conditions or poor nutrition. A dirtyenvironment can be caused by a variety of reasons - from lack of cleaning of the cage to overfeeding of your Bettafish. Bettas are very sensitive to overfeeding and extra food sinks to the bottom of their tanks, dissolving, andcreating a toxic stew that they swim through. Overeating also weakens their immune systems, leaving them more proneto infections of all sorts.Other symptoms of a fungus infection include a lowering in the appetite of your Betta fish, and in less commoncases can cause your Betta fish to discolor. It must be said, however, that these two symptoms are also thesymptoms for a variety of other common fish diseases so unless these symptoms coincide with the visible fungus, onecannot be sure a fungal infection is what they are dealing with.Once your Betta is afflicted with a fungal infection, it is vital to get the infection cleared up as soon aspossible. Unless the fish is very severely affected by the fungus, or is left untreated for an extended period oftime, Bettas survive these common fungal infections quite easily. It is vital that the offending culprit - mostlikely dirty water - is attended to.