up here limestone quarries are home to many kinds of fish. they dissolve slowly, act
as a buffer and keep the pH nice and stable. dont use marble chips, however. Ingrid

"Davy" wrote:

I intend to put stones or pebbles in my wildlife pond which won't have any
fish apart from maybe the odd stickleback. My preferred pebbles are
limestone but I have seen a warning against using limestone pebbles because
they can change the ph. Should I take this warning seriously?
thanks, Davy




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