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Re: Substrates (Coal?)
There used to be a guy who used coal in his miniature furnished aquarium
exhibits at local open shows in the London area. The rocks and the
gravel were composed entirely of coal. It was an extremely attractive
set up. The only problem I can think of is that the size of granule
would be difficult to control and it would have to be thoroughly washed.
Coal I believe is highly porous and so may make a good substrate. All
this is IMO.