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I started a ten gallon tank today, to be a non-CO2, moderate light tank, using zeolite sand and Leonardite (Diamond Black) substrate. My goal is primarily to see how well zeolite sand works as a substrate, secondarily to see how a Barr non-CO2 setup works. Zeolite Sand is sold as a swimming pool filter sand and consists of particles from about half a mm to 1.5 mm in diameter. Diamond Black is a proprietary brand of Leonardite granules, which is a very nutrient rich near-lignite coal material.
This is Diamond Black
I used 3 pounds of Diamond Black in the bottom of the tank, not washed, just poured in to make a layer about 1/2 inch thick.
The zeosand presented a bit of a problem. I have already found that it can make the water extremely cloudy if you just add water to it. That seems to be because it has quite a bit of dust in it, plus the less than 1 mm particles. To get around this I used a small spaghetti strainer to screen out the fines, which I added first on top of the Diamond Black. Then I mixed a layer of the fines plus about an equal amount of zeosand direct from the bag and made a layer about an inch thick of that. Finally, the screened out 1+ mm particles went on top, for another 1/2 inch layer, giving about 2 inches of zeosand in total.
Next, I added just enough water drained from my other tank, by my continuous water change system, to cover the substrate and added a couple of rocks and some Hygro "Porto Velho" and Lobelia cardinalis small form.
The white "plate" in the photo is the steamer basket from a "Healthy Choice Cafe Steamer" TV dinner, used to pour the water over to avoid disturbing the substrate - it works perfectly.
After adding Prime and a tsp of Equillibrium to the water (original GH is 3 dGH), I finished filling the tank started the HOB filter, and added the hood and light. The hood/light is a Perfecto unit, modified to use two CFL screw-in 15 watt bulbs, with reflectors.
Now we wait for the water to clear up, and soon we can see how zeosand works as a substrate for this type of tank.
I omitted adding mulm to the substrate just to see if zeosand will absorb any ammonia that shows up, and prevent early algae problems.

This is Diamond Black
I used 3 pounds of Diamond Black in the bottom of the tank, not washed, just poured in to make a layer about 1/2 inch thick.

The zeosand presented a bit of a problem. I have already found that it can make the water extremely cloudy if you just add water to it. That seems to be because it has quite a bit of dust in it, plus the less than 1 mm particles. To get around this I used a small spaghetti strainer to screen out the fines, which I added first on top of the Diamond Black. Then I mixed a layer of the fines plus about an equal amount of zeosand direct from the bag and made a layer about an inch thick of that. Finally, the screened out 1+ mm particles went on top, for another 1/2 inch layer, giving about 2 inches of zeosand in total.

Next, I added just enough water drained from my other tank, by my continuous water change system, to cover the substrate and added a couple of rocks and some Hygro "Porto Velho" and Lobelia cardinalis small form.

The white "plate" in the photo is the steamer basket from a "Healthy Choice Cafe Steamer" TV dinner, used to pour the water over to avoid disturbing the substrate - it works perfectly.
After adding Prime and a tsp of Equillibrium to the water (original GH is 3 dGH), I finished filling the tank started the HOB filter, and added the hood and light. The hood/light is a Perfecto unit, modified to use two CFL screw-in 15 watt bulbs, with reflectors.

Now we wait for the water to clear up, and soon we can see how zeosand works as a substrate for this type of tank.
I omitted adding mulm to the substrate just to see if zeosand will absorb any ammonia that shows up, and prevent early algae problems.