Curly Willow Branches in the aquarium???
 

I am really trying to find something to add with manzanita. Are curly willow branches safe for the aqiuarium?

I can't really see any problems with this, you will obviously have to bleach it and scrub it then submerge it in water for about a month to become totally waterlogged, and for any tannins, pesticides etc. to be neutralised, plus change the water regularly
But well treated wood should be ok.
I can not guarantee if wood nibblers like plecs will be ok though.
Ray