The reason most use Chaeto Is because the others go asexual and try and reproduce In your tank, The result Is a tank that looks like you poured a gallon of milk In. There are some that are safe like Halimeda, Bottle brush, Lettuce and I'm sure some others. They sell Algae packs online, As I don't know anyone In the club that has these types of algae On hand. Just my 2 cents
Bill