Questions from a relatively new herp enthusiast. I have a piece of cork bark in my leuc tank that is incorporated into a waterfall system. I just installed an Exo Terra 2.0 along with the 5.0 I was already using. Today I noticed green growth on my cork bark (pic attached). First question is, does tis look like algae or something else. My next question is, is it harmful to my leucs? If so, what do I do. Also, why grow now? Increased UVA? I look forward to some expert advice. Thanks for your help.