Possibly wrong type of soil? I don't know I'm no expert
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I use the same concept for the dirt mixture (minus the clay pots didn't think about it). If you can figure out how the dirt got into the water column it will be an easy fix. The first time is always the most difficult because there just isn't a plethora of posts out there about
it. It seems like most people want to keep it a secret and make you pay for their "secret" mixture or a how to manual. I definitely struggled the first time, but i just bit the bullet and went for it.
I just mix organic soil with about a cup or two of sand, peat moss, red clay if I have any laying around (I used API first layer this time) and at this time Ill place my root tabs. Then cap it with pool filter sand ($10-12 for a 50lb bag). With a planted tank you can't really have substrate too deep because roots grow to the food source. In my 30g the substrate is close to 6" in the back corner and about 3-4" in the front.
Also LukeOscar makes a point, I don't really see any substrate on top of the dirt, could just be because its all black, but was there anything on top of it to begin with?

I just took the tank into the bathroom, drained the water, and then filled and drained it 6 more times until the water was clearish.
I'm sure this has all been said in here already, but I feel it needs repeating incase it hasn't. I just did a dirt tank, and the water was filthy at first. I just took the tank into the bathroom, drained the water, and then filled and drained it 6 more times until the water was clearish. I then put the tank in its proper place, planted it, filled it again, and stuffed my filter with filter floss. It took two floss changes and about 8 hours to clean my water. Now I have a clear, clean little planted tank!