coral rubble

[tank]

I was wondering what coral rubble would do to the water par
ive added some to my sump and as of yet found no diff what do u guys think

[Ben]

Hi Vince,

when you you mention rubble you also mean crushed coral. How much did you add?

i am also using crushed coral and believe more is needed than shell grit to get water parameter to change.

ben

[tank]

Hey Ben
the rubble is more like crushed bones small bits and larger type
I noticed that my lfs had layed the bottom of their sump with the rubble and quite a large amount of it
they say it acts as a buffer and helps with the bacti
i have used about 4 large hand fulls, but i have mine in a stocking in case i need to remove it