thank you for not using the word DANGEROUS. All plants, being algae or other higher order plants have the same needs in terms of food. The reason people use other plants to combat the stuff is because of that fact. The uptake and removal of other forms of plant life will help rid a tank of the stuff you dont want accumulating. In a planted tank or a reef tank you want as little algae as possible as it will cover corals and the leaves of plants, overgrowing and taking over if left unkept. I dont want a planted tank(well i do but we will start a new post for that) but i do like the benefits of full spectrum lighting. One reason for my argument for hair algae is that it can be asthetically pleasing, without all the necessary fertilizers, and required trimming associated with the higher order plant forms. Another reason is the fact that it does play a role in the removal of excess nutrients. My fish LOVE the stuff, and the fact that I have had hard to keep species thrive in tanks with HEAVY algae growth until they could be coaxed into eating other foods makes me believe that the benefits GREATLY outweigh the risks. And daddyo, as much as i bagged on you and vice versa, i have been waiting for someone who likes a good debate as much as i do. Thanks for keepin it up and putting up with my hard ass head. Happy fish keepin dude. hope to share some more good posts with you.