Upgrading to tank with sump

[tharkema]

I have bought a used tank with sump that I will be swapping with my current sumpless tank. I am planning on doing this hopefully midweek. I have a couple of concerns that I am trying to address before I dive into this tank swap.

When swapping tanks...

1. Should I keep any of the old live sand or go with all new live sand (I have purchased a bunch of new live sand already)?

2. How should I go about cleaning the live rock from the old tank before putting into new tank? Just mix a bucket of saltwater and rinse.... any suggestions would be appreciated. I have a couple pieces with hair algae should I isolate them in a sealed bucket for a while to help get rid of it?

3. When using a sump is a filter still necessary? I currently have a fluval 405... and not sure if I still need it or can I sell it with old tank? Please Note: I had an AquaC remora HOB skimmer, but have upgraded to a Tunze 9410 and in the process of adding 2 phosban reactors, one for Rowaphos and one for Carbon.

4. I have a small refugium section in my sump and wondering if I should use live rock rubble or sand bed?

Thanks for any comments and suggestions that may help me out.