I live in an area that has tons of Manzanita that I would like to collect and use in my 20gal tank. I watched a YouTube video that showed how to collect dead Manzanita, along with how to clean it. One question someone had asked was whether or not the pieces he used were too old and decayed? Can anyone give me some advice on what to look for in the way of dead branches? Is there an indication that they may be too old or decayed to work in an aquarium? Other than the obvious that they are falling apart?