Halimeda spp harvesting
 

I was hoping to grow it a little just for looks, then eventually keep it trimmed

does it matter where I cut it?

should I cut the oldest area's and leave the new growth?

does any of it natural die of old age?
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This algae grows fast and pulls lots of calcium of your water. I try to get as much as possible when I pull it out.

You can cut or tear from any part of the plant without harming it. Any area that touches a hard surface can attach itself. Its very easy to grow and can become a problem in some tanks if its not kept in check. I've never seen any of my own die and its existed in my tank for several years so I don't think you need to worry about it dying of old age.

You can find your own quotes in this article.
Halimeda: The Cactus Algae
http://reefkeeping.com/issues/2004-04/nftt/index.php

thanks for the link.

I'm going to keep it trimmed, using it mainly for looks and to fill an small partitioned area in the fuge that has rock rubble.