If it feels 'dry' not slimy, it probably is cladophora. Quite a though algae, directly nuke it with h2o2 or excel. If it spreads around your tank, it gets hard to eradicate...
Thanks man. h202 is hidrogen pereoksir or ?. I dont know what is excel.
Are you thinking that short photoperiod and co2 from bottle will be enough to kill this algae?