I have the same problem with anaerobic substrates some time back. It was with my E. oriental. The plant keep dying when the roots start rotting in the anaerobic substrate. It happened only when the plant was just introduced. Now, the plant has fully establish itself and has no problem with the substrate anymore.
Anaerobic substrate is not totally bad... I think. It helps in the reduction of Fe3+ to Fe2+ so that it can be absorbed through the roots.
BC
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