You can pick it out by hand as best as you can. Are there any powerheads in your setup? Once you manually remove it, you can move a powerhead closer to the area to increase the flow in that part of the tank.
Worst case scenario is to use Chemiclean but that is only a temporary fix. It will come back if the root of the problem isn't fixed, and when it does, it gets harder and harder to remove.
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