shouldnt use sandstone. f*cks up the ph.
go to your nearest beach (say fife) and get free rocks. thats where most of the fish shops in the u.k get theres from. just make sure they arent pourous. i got loads for my cousins tank last summer when we went to the beach. huge rocks. took us 5 trips up and down the shore and loading them things into the boot.
its amazing what you can find for free when you look for them.
go to your nearest beach (say fife) and get free rocks. thats where most of the fish shops in the u.k get theres from. just make sure they arent pourous. i got loads for my cousins tank last summer when we went to the beach. huge rocks. took us 5 trips up and down the shore and loading them things into the boot.
its amazing what you can find for free when you look for them.