I used ADA black soil but has the same problem - but it probably because I wash the soil b4 - so stuipd.
However I leant one trick from this site - cut a piece of plastic bag and lay it on the soil, then fill in water slowly, if the plastic flow, doesn't matter, as long as no water drop directly on the soil will be fine, when the tank is full then remove the plastic sheet slowly.
Also you can do this few times (suck out the muddy water immediately) then it should be a lot better.
Then just need to wait the cloudy water disappear. Also u can get some "old water" from other fish friend to help the bateria build up~~
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