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I have a gravel substrate and under gravel filtration along with built in sponge filtration. I also like having cory but only have one. I would like to add some more cory but would want the proper surface for them to dig and forage. My problem is that, using under gravel filtration, sand would just sift through the existing gravel and wipe out the under gravel filtration.
While doing other searches I've come across fine mesh material that is supposed to alleviate this potential issue. From the little I've looked this material would prevent the sand from sifting through the gravel base. If anyone knows the material to which I refer, could I remove all bottom decorations and lay this material over the gravel base and then add sand? If the little I've read is true, and I understand correctly, I'd add something like a half inch of black sand which would give a decent base for the corys and, also, add to the under gravel filtration by giving a finer filter media.
As a side question can you add different types of cory and still have them happy or do you need all to be of the same type?
While doing other searches I've come across fine mesh material that is supposed to alleviate this potential issue. From the little I've looked this material would prevent the sand from sifting through the gravel base. If anyone knows the material to which I refer, could I remove all bottom decorations and lay this material over the gravel base and then add sand? If the little I've read is true, and I understand correctly, I'd add something like a half inch of black sand which would give a decent base for the corys and, also, add to the under gravel filtration by giving a finer filter media.
As a side question can you add different types of cory and still have them happy or do you need all to be of the same type?