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Profile/Fluourite and Cories or Khuli loaches

Heide asked in Cory cats could be kept in a tank with fluorite substrate.

I have 4 panda cories in a tank with a 60% fluorite/40% small uncoated
gravel substrate and they are fine, rooting around happily with no sign of
injury or distress. My feeling is that this worry about sharp gravel hurting
fish is largely if not totally fictitious. In fact the fellow at one of the
LFS says he has actually collected cories in the wild off gravel beds as
sharp as any gravel you'll find in a fish tank.

Peter G. Aitken