Phil Dietz wrote:

I have a 10 gallon tank already established with plants and fish.
The floor is plain gravel (blue !!) of a larger size.

I'd like to build up a layer of substrate underneath it without
disturbing the tank too much.

When you mix small gravel with large gravel doesn't the large gravel tend
to rise to the top? You might try mixing some flourite with your gravel
and stirring it up a bit to get the blue gravel back to the surface. The
flourite seems to be lighter than gravel, though. Perhaps that is just
my imagination there....

Anyway, that might be worth a try since the flourite is an excellent
growth medium.


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Scott Lewis