Changing tanks

I currently have a 20 gallon long and i am thinking about upgrading to a 29 gallon. They are basically the same dimensions besides the fact that the 29 gallon is 6 inchs higher. But my question is how do i go about doing this? I also have a 10 gallon sump set up and want to keep that too.

 

IMHO , I wouldn't upgrade for a taller tank, if I was upgrading it would be for "fish swim" area, ie length.

Changing the tank over - I started keeping my water changes for a month then just topped up with RODI water, adjusted the salt, matched the temps, and the started moving rock and sand a little at a time, then on move day, moved everything else, topped up the tank and turned off the lights, then moved the fish left them for a couple of hours to "sulk" then just started the lights as I always did.

 

I dont really care about the fish swimming area, i only have a mandrine and a clown that doesnt move from his anemone besides to eat. i just want more room for coral and such.

 

I would get new sand for the new tank and transfer over a cup of clean sand from the existing running tank.

Is the sump plumbed in or something else?

In the long run and a perfect world I would set up the larger tank with new sand, add premixed SW move over about 1/2 the rock and seeded sand, add some fish food or a raw shrimp and test for Ammonia and Nitrites for 1 week.

Post those values in a week and see where you stand.

It should be a fairly easy transfer. The safest bet is to have fresh SW and an Ammonia neutralizing product like Pime or equivalent on hand.