I agree, my Cory's spend half their time darting around. They dig like crazy in the sand but don't mind my moss or weaving in between the planted jungle, ha ha.
I've kept small Cories for a long time - even in really fine sand - and have never had much of an uprooting problem with them.
My C. habrosus love to rest on mounds of moss or on small Crypt leaves and seem to only dig around in open spaces. They'll have enough space in the 12gal long with all that moss that they won't make a noticeable mess.
C. pygmaeus aren't much for staying on the bottom of the tank, though, and tend to dart about in open water.
I have moss growing in SS squares in my tank with habrosus and they seem to enjoy rooting around through the moss as much as through the sand... I would expect them to do fine in a "carpeted" tank
I've been contemplating about moving all of my Corydoras pygmaeus from my 11.4G with a sand substrate to the 12G long with a moss carpet. The 11.4G is heavily planted and for whatever reason, my cories seem to hide a lot, so I rarely ever see them.
20 C. pygmaeus and they're still hiding out? Hopefully this new tank environment helps with that.
Mine usually get really brave when they hit about 8 or 9 in number.
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