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[APD] Re: High water evaporation in a planted aquarium

In fish-only tanks, accumulation of nitrate and phophate is an 
*indication* of poor water quality and the main reason for water 
changes. However, accumulation of these nutrients is rarely a problem 
in planted setups. But, maybe I'm just being paranoid here, if water 
changes were not performed, would other harmful compounds accumulate 
that cannot be tested for with hobbist test kits? (Excluding problems 
of evaporation that have already been discussed). 

Clint Brearley
Melbourne, Australia

> I know theres no getting around water changes....but
> I am curious.  The main reason for water changes, is to get 
> nitrates etc out
> of the tank water, and to replenish it with new water with 
> nutients etc...
> In a plant tank though, plants use a lot of those 'bad' things you are
> trying to take out with the water changes...phosphates, nitrates, 
> not sure
> what else.   So it appears as the main reason for a water change 
> in a
> planted tank, is more for replenishment then removal?  I am 
> probably wrong
> there.

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