If you do decide to set up another tank make sure to start a journal for it! You could always just make lots of tibees
! AND MY TIGERS ARE BERRIED!!!! Two of them are so far. Hoping those breed out!! Snapped a few pics in my journal haha.
At least that isn't as nerve wracking as having the shrimp shipment sitting in the warehouse. Then I'd be tempted to drive and pick those up lol. But congrats on the shrimps arriving soon! After they arrive you'd wanna keep the tank renovations to a minimum if you want lots of breeding. When you start getting babies you can renovate all you want afterwards!
The filter change is really up to you. My shrimp tanks work fine with a HOB. But then again I'm not willing the shell out more money for sponge filters. You could actually keep both the sponge and internal filter inside your tanks and have two sources of beneficial bacteria for when you have to clean one out. But it's all up to you :]!!