Join Date: Nov 2010
Location: Bern, Switzerland
crusshed oyster shells to harden water?
Hi, I started a guppy tank about 3 months ago. I've added plants and driftwood, but while i knew the wood would soften the water, I didn't realise guppies prefer hard water. I was also recently given a couple of mystery snails. My normal tank pH is around 6.5 and GH/KH are usually below 20ppm. I was advised to either remove the wood (already planted with moss and ferns) or add crushed oyster shells.
I have decided to go down the oyster shells route. I have a 70L tank and today washed and sprinkled a couple of handfuls of oyster shells over my substrate. How long after adding oyster shells can I expect to see a change in the water parameters?