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Fluorite and Corys
Yes, I think it's a potential problem, but not a major problem. I have a
planted tank with a fluorite substrate and a large school of various
Corydoras spp. I find that small spp. (such as the pygmy Corys you mention)
with delicate barbels do experience some degree of barbel erosion. Larger
Cory spp. (most Corys) seem to do fine.
A smoother substrate would be preferable if you were motivated to keep your
Cories in peak condition. Many catfish, Corys included, like to sift through
the substrate by ingesting a portion of it, extracting the microfauna inside
and then spitting out the remaining substrate. For Corys, this isn't
practical with anything except sand.
I was thinking of trying the black Onyx sand in future tanks with plants and
substrate sifting catfish.
(While abrasion by the substrate is one cause of barbel erosion in Corys,
unclean water and the resulting buildups of pathogens is a more common
> Date: Sat, 16 Dec 2000 09:28:05 -0700
> From: "Ellen O'Connell" <oconnell_wadeash at ix_netcom.com>
> Subject: Flourite and Corys
> I'm ready to set up a second tank and was going to try a flourite substrate
> when there was a post on another list to the effect that it's not a good
> substrate for corys -- no barbels on many corys in tanks with it. It seems
> to me there are probably more flourite users on this list than on general
> fish lists, and so I'm inquiring here. Not only would there be corys in
> this tank, but pygmy corys. Is flourite a problem and are there (commonly
> available) substrates that would be better for them? Thanks for any info.
> Ellen O'Connell
> mailto:oconnell_wadeash at ix_netcom.com