Not Quiting

[murph213]

Hello everyone , I had lost my fish while I was on weekend vacation due to a power failure. Although my fish and critters died
I wanted to go back to freshwater.

However my live rock is looking good and I am going to stay in the hobby. I now have a back up power supply.

Now for my question? Do I need to cycle my 55 gallon tank again?
I also want to change my substrate from cc to something better.
Any advice on that too would help.

Thanks ,

Murph