I use the same substrate in my tanks. I rinsed well then put fresh filter floss in my filter. Cleared it up in an hour. Then threw away the white filter floss (which had turned completely black) and put in fresh floss. I hope you've saved the bacteria from your filter though or else your fish will suffer from cycling the tank again.
I also learned that if you add a thin layer of sand to "cap" the substrate, it won't ever be murky.
Good luck!
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