Hair algae won't hurt your fish, but in your attempt to grow it, you may find it grows in places other that where you want it. It could get out of control, but if you want to try it, adding more lighting is probably the best way to go about it. A little bit of sunlight would probably do the trick.
Personally, I really like the look of java moss on driftwood if it is kept in check. Riccia is another popular one, but it needs high lighting. There is also something in the trade called "christmas tree moss" but i don't know much about that one.
Is it algae I want???
Discuss all topics related to freshwater and planted tanks.