k2snowboards88 said:
Is it possible to give him a dip in fermaldahyde?

Formaldehyde is a very aggressive treatment, you shouldn't use that in such light cases. I hope you didn't dip him for over 10 seconds...to do so can severly damage such delicate tissue..like the gills. Actually I've never heard of anyone wanting to dip their tropical fish in this..only large hardy fish like Koi and salmon ( in ahtcheries settings).
I replied in your thread in the Betta forum.
That is in no way Dropsy. A fish with Dropsy is bloated all over, and his scales will stick out, making the fish appear to look like a pine comb.
Your Betta has gills that he can flip out, when he is excited/angry...which is why they look swollen...they are supposed to look like that.
Why would you say that is Columaris..there are no white fuzzy patches on this fish? Columaris is charistarized by thick, white, cottony patches on the fishes mouth and head....this fish has nothing similar going on.
From what I see there is nothing wrong with this fish. Many betta's have a dark, non shiny colored scales on their head, if they get angry (i.e. seeing themselves in a mirror or another fish) it will get darker, as will the rest of him).
Just because you just got your fish doesn't mean the water conditions can't be a culprit..you don't know what hsi situation was where he came from.
If you didn't properly acclimatize him, that is a water condition in itself.
Make sure your water temp is atleast 76-80 (they prefer warmer...like 80*), and he will be more active. They like to lounge about, try getting him a silk plant with broad leaves, so he doesn't have to lay on the bottom, where his waste settles.
Some fish are just slow to get used to their new environment. I have fish I've had for a while that act "pouty" and lay on the bottom after each water change.
A teaspoon of aquarium salt per gallon could also help him if he is acting lethagic..since he is relatively new, and will help reduce stress and any infections that could result from the stress of the new environment.