Ok So the consensus is that it can be done. a small amout at a time if i completely remove the old or just placing the new sand on top of the old in one shot.
Mike,Ziggy, Thats very interesting. i thought of doing that same thing, just placing the bigger particle sand on top but wasn't sure it that will cause a cycle or not. I guess it would be the same as adding base rock to the tank at any time. This may be the way to go.
Cmor, I know what you are saying. the Goby will always move the sand around. but I've seen gobies at the LFS
sifting sand with way bigger particles than what I have and it didn't seem to make a sand storm, thats what got me thinking. I'll have to take a ride back out to the LFS
to see the size of the particles in the sand I linked to.
What will waiting a few more months do for the sand? I'm just asking because frankly i don't know.
although it may take me a few months to get the free time to do the substrate change. I just started a new Job as an EMT so I'll be short on free time for a little while.