I'm thinking that a vigorous regular vacuuming could draw out all of the
sand and leave behind the gravel and fluorite. Is 90% fluorite unacceptable?

chet

"Aqua" wrote in message
...
I am planning to change my substrate of my existing 55gal tank. Currently
I
have 60% Fluorite, 10% Gravel (Pet$Mart) and 30% Pool Sand. I going to
have
100 % Fluorite.

How do I change it without affecting my filtration and my live stock?

I thought of changing 25% of gravel every week for 4 weeks. Is it a good
idea?

I appreciate any of your ideas.

Dominic
http://www.dlink.org/aqua