The cory cat thing, that is. They kept dying on me when I only bought 1 cory at a time, so I refused to buy any more. With the advice from Kingyo I realized they are schooling fish, as well as something in their diet needed to be changed, so here I am again, with 2 albino cory's this time, and they got their first bloodworm dinner tonight! Cats, this is your last chance, so you better make it this time!

Many possibilities of death amongst Corydoras, for starters they are already in HORRIBLE conditions at LFS, so your original selection to purchase is very important, healthy barbels, sparkly eyes, etc. and also did you check your tank parameters?

Good luck andrea, I havn't had any good luck with corys either.

EDIT: sorry i double posted...

I cant remember if we talked about this before or not, but what kind of substrate do you have in there? Their little barbels are very sensitive to sharp rocks, and the pea gravel I used to have in my 30 wore all their barbels down. Now I have much finer, rounded gravel in there (its basically large grains of sand) and all is well. Im even managing to keep the delicate panda corys alive! Yes, they definitely are a schooling (shoaling?) fish, like tetras, and prefer their own company. I actually have about 8 or 9 total with 4 different species, but they all get along. You can tell that within that group they like to be with their own kind, though.

They also are carnivorous. Mine just love frozen bloodworms. I have to throw a ton in there to make sure some make it down past the tetras! They also like shrimp pellets, flakes and Hikari algae wafers.