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With the MTS you won't have any aerobic pockets so you won't have to worry about that. Depending on the plants and the bioload you may have to fertilize. I found a sloping sand works best for me I use about 3 inches in the back down to about an 1 1/2 inches in the front. Are you using any topsoil underneath the sand like the Diana Walstad el natural approach?
The mystery leech in your tank are you sure it is harmless? The other leech shouldn't be a problem.
Depending on how many fish you have you might want to consider keeping the filter for oxygen.
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