Tank upgrade. Transfering stock recommendations pls !

[Reef Man]

Hi !!

My actual tank is a cube, 20" per side.
It contains:
-35 pounds of live (very life and populated) sand.
-20 pounds of live rock, covered 85-90% of coralline and lots of feather dusters
-Caulerpa Taxifolia
-25 mushrooms of differents species and colors
-Royal gramma
-Blue Tailed Damsel
-Tomato Clown
-Lawnmower Blennie
-Peppermint Shrimp

My new tank is 40" x 20" x 20"

It will have a 14 gal refugium where I will place all the caulerpa.
and a 14 gal sump with a Red Sea Berlin with venturi valve mod.
A Mag 7 is the return pump an other Mag 7 for the skimmer.

The new tank was filled with water on Saturday and the salt was added yesterday and today is ready to go.

How would you transfer all from the cube tank, to the new one ? do I need to go slowly? or can I do it using the water from the previous tank with problems?

I already have dry sand and base dry rock to place on the new tank to complement.

Thanks in advance !!!!

[scubadude]

I have done this a couple of times.

I would do it real slow w/ w/c's fill up the new tank with the rest of the water from your old tank and put all the live sand from your old tank in the new tank ontop of the new sand you put in. You will probably have a few spikes but if you dont stir up your sand too much then you should be ok....I would probably think about keeping the corals and fish in the old tank for the longer you can. I only took the real clean live sand from my old tank into my new tank...worked out real nice. Have alot of good clean water and salt on hand and you can do it. HTH