Many thanks for your reply, I have heard of tanks that have mysteriously crashed after several years and I guess this is due to the rock no longer performing its function.
It stands to reason that if the porous nature of the rock is impeded by algae then the biological processes cease. Is it therefore reasonable to put older rock in the dark for a week so that the corraline and other algae die off or is that not long enough.
I am trying to decide between stocking my new tank with fresh rock from a system or getting some "used" rock at a better price? I guess if I can get some older rock from a tank, dump it in a vat with the lid on to cut out light it could be left for longer if necessary(with heater and circulation pump)
I would apprecaite your thoughts.
Thanks
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