I'm not on my regular computer so the photo isn't showing up, and I can't see where the "yuck" is located..... If it's on the bottom, I use a turkey baster to remove anything on the bottom. Then I just acclimate for a long time, where I keep removing small amounts of yucky water from the cup, and replace it with an equal volume of new water. (About 1 to 1.5 ounces each time.) For a new fish, I'll do this for several hours, and gradually, the water becomes cleaner. When he's ready to put into the tank, I'll remove as much water as I can, still with the turkey baster. Then I slowly allow the cup to fill with new water, and I release him into the tank.
I realize there are a lot of ways to do this, but this is the method that has worked well so far for me. I can't see the pic though, so I don't know specifically what you're dealing with in the cup.
Last edited by LittleBlueFishlets; 03-26-2013 at 10:07 PM.