Not to say I've confirmed it's green coralline algae, but theres this rock solid algae that's been growing on my tank glass for a few months now, and I even though I scrape it weekly, it takes up to 30 minutes to finally scrape it all off only for it to grow back in under two days. I cannot even take pictures of the tank anymore because you can't even see inside the tank unless you look from the top. I've dealt with diatoms, hair algae, and bryopsis. But none of them are nearly as difficult to control as this algae in question. Any experience? Luck? Solutions? I will edit this and attach a photo once I am available to do so.