I'm changing to a similar setup to Reg but I'm keeping a couple of albino
cories and otos so would 2" flourite on bottom and 1" plain gravel on top be
ok for a planted tank to prevent damage to my cories.

Many people keep corys with Flourite substrates, and they aren't damaged by it.
My school of panda corys were babies, less than an inch, when I got them, and
they were fine with 100% Flourite.

I'm thinking the
layers should stay where they are unless the flourite is sucked to the
surface when I vaccuum the gravel.

Flourite is very light. It's made of baked clay, and so is lighter than
ordinary sand or gravel. So it tends to end up on top, unless you're very
careful.

You might consider Onyx Sand. It's like Flourite, only it's a gray sand. My
corys are now in a tank with 100% Onyx Sand as a substrate, and they love it.

Here's a table summarizing my experiences with Onyx and Flourite:

http://www.fortunecity.com/lavender/...n/881/onyx.htm


Leigh

http://www.fortunecity.com/lavender/halloween/881/