How long has the tank been running? I see you have LR
also so I would not worry about cleaning the plants there will be plenty of bacteria on the LR
Algae I know of no online site I would try a google and see what hits.
If you post a pic I'm sure someone on this site can answer your questions.
If you have a outbreak you will know it...... It will take over your tank covering the LR
and certian algaes will be on the sand bed. Most algaes feed off of excess nutrients in your tank. These can come from using tap water, over feeding things of this nature. Depending on what algae you have would determine what course you need to take to get rid of it.