Serious Problem With Male Betta

I've been having problems with my betta pretty much since I got him. I've done quarantines with salt water, and than I've also used maracyn, I've tried fresh water changes daily. This really only helped a little for his fin rot. Than I put him back in the cycled tank and now I'm noticing that his fins are worse than ever, it looks like they were cut off in the back, plus his dorsal fin looks as though it's just slowly rotting and turning into scar tissue. Or at least that's what it looks like. NOW I'm noticing that his left side is seriously compromised and I just don't know how to help him! His left pectoral fin has a section missing at the center. Also he can't flare that side of his face only the right. And I just realized his eye looks a little swollen compared to the right, except it doesn't look like a pop eye just yet. But I wouldn't be surprised if it turns into it. I should also add in that yesterday I noticed this stuff hanging off the tips of his fins. At first I thought it was a cottony growth so I used a q-tip to see if it would come off. Whatever it was just kind of fell off of him, but now it's back. I was thinking it was the sand in the tank, but it just started happening and he's been in this tank for months....seriously I just don't know what to do for him.

[seattlemom2plus]

ugh I know this post is old but hope your beta improved, we had one and he didn't make it :(