Re-Arrange

Just rinse the filter media in clean, dechlorinated water to remove any solid waste. They last a very long time, and you don't lose the bacteria.

How were you thinking of re-arranging? The bettas and barbs shouldn't be mixed, and danios can be nippy with bettas as well. Combining the male and female betta will not work in the long run--the males can kill a female that it not ready to mate, especially in smaller tanks.

I agree with OrionGirl, there really is no other way to arrange your fish. You could get more fish for your 29 though. Maybe some cories for the bottom, or a rainbow shark or red tailed black shark.

I have never kept ghost shrimps, but maybe (just guessing here) if you put in some plants (even fake ones) in the 5 and 10 gallon, that would help them out? The scared ones would have a place to hide out, and the hungry ones could get some food that lands in the plants before the betta can get to it?

If you want to make a tank look different, changing gravel/substrate or decorations can make a tank look totally different...

Here are 2 pictures of my tank... exact same fish, totally different decor and gravel

Before:
http://im1.shutterfly.com/procserv/47b4da08b3127ccebde810ba18b80000001610

After: (don't mind the nylons full of gravel off to the right of the picture!)
http://im1.shutterfly.com/procserv/47b4d820b3127ccebf202a3ff56d0000002610

Have fun!
~Tara

The 10 should be fine with those fish, as long as the media is established. I'd still worry about the danios picking on the female betta--they can be nippy, and faster than her. The shrimp could go in there as well, as long as there are hiding places.