Knew this would happen

[BC Mosaic]

OK. OK. OK.

I think I've got this figured out. There'll be circulation in the main tank with Tunze wave maker and Koralias.
The refugium will have a small power head to circulate the water.
The other refugium will also have a small power head.
My concern is that water trapped between the baffles has to be removed but there are so many sponges growing there. They will die and there is no real way to clean it out so when it starts up again......just as nasty.
So, trade off is I do this now and 24 hrs. later I start up again.
What's the consensus?