Hi Byron, I saw that you wrote in a comment a while back that you gave flourite a try and that your cories didn't like them. Was it the regular flourite? or flourite sand? Thanks for your time! I know you're a cory fan and i value your opinion. It was the regular Flourite Black; I have not tried the sand. But aside from the roughness, the plants were no better in this tank than in others with plain sand or gravel, so in my view I would not waste the money. B.