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I would stick with your friend's substrate and give it a chance. It seems like he knows what he is doing.
When you say "some CEC," how much does that translate into? You will need a layer of something iron rich, and that would be the kitty litter. The rest is up to you. MTS works great, and all substrates end up getting about equally "messy." You could try Aquasoil, but that eventually will break down as well and get messy/sludgy. You could do a layer of kitty litter, a layer of laterite, and cap it with Eco or Tahitian moon sand.
This might help, too! http://www.aquabotanic.com/?cat=4
When you say "some CEC," how much does that translate into? You will need a layer of something iron rich, and that would be the kitty litter. The rest is up to you. MTS works great, and all substrates end up getting about equally "messy." You could try Aquasoil, but that eventually will break down as well and get messy/sludgy. You could do a layer of kitty litter, a layer of laterite, and cap it with Eco or Tahitian moon sand.
This might help, too! http://www.aquabotanic.com/?cat=4