In article , Earl D Fitzgerald
writes
Just use crushed coral or coral sand to harden your water. A good inch
or so should leach enough hardness to make the water desireable for
your fish. You can use granite stones to create the ground cover for
the fish.

That sounds like the advice I wanted to hear !!

Seriously, if the coral is going to do the job on its own, then I don't
need to worry about getting the right rocks. I can just choose what
looks best.

Thanx for that

--
Alan Silver