I really hate to tell you what you should do. I have never had any real experance with cory cats and can see where flourite might cause a problem. I do know that ADA substates are more rounded and "softer" than Seachem, so you could do that instead.
Whatever you use, the heavier substrate will evently make its way to the top, not in great quantities but a little bit. Either from a fish hollwing out a spot or uprooting plants pulling it out, the base substarate will find a way out.
On a 55G a base of ADA Amazonia would cost around $30, cap that off with sand to your liking and you should be good.
Whatever you use, the heavier substrate will evently make its way to the top, not in great quantities but a little bit. Either from a fish hollwing out a spot or uprooting plants pulling it out, the base substarate will find a way out.
On a 55G a base of ADA Amazonia would cost around $30, cap that off with sand to your liking and you should be good.
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