Help My beta is ill

[Beyond Limitations]

I just got this blue beta yesterday and he's now laying in the bottom of the tank with white flakes coming off of him and he appears to be having trouble swimming. I treated his water before I got him, he has a heater and I even went out and bought medication. I'm afraid he's going to die by the end of the night and I don't know what else I can do for him.

[callistra]

More info needed: http://www.bettafish.com/forumdisplay.php?f=99 Photos would be helpful.

How did you acclimate to the new water? What conditioner are you using? How much did you add?

[Beyond Limitations]

I don't have photos, I have no camera or phone. And I slowly introduced him to the tank water 25% at a time for fifteen minute rotations so I wouldn't shock him. I did that right didn't I?