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Tank Life



All the talk about adding soil/peat/other organics to your substrate seems
like it will only last a short time before the need arises to replace the
material used by the plants.

Is this the case?

I would like a method which can be set up for numerous years (5+) without
any need to tear down the system to replace the substrate. Would
laterite perform this function for a long enough time.

Another thought is, is anybody out there not using CO2?  While the expense
is one problem I have also read that certain fast growing plants end up
looking bad in a CO2 system and thus shouldn't be used.  Also a problem I
have always seen is how is the water for water changes brought to the same
pH of the tank system with the CO2 bringing the pH down?

Thanks

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