I had this strange moss or algae pop up about a year ago. I believe it originally came from a petco plant. I always throw away whatever I see but it’ll still pop up in small patches every few months, usually in the same few spots. It doesn’t spread like algae and it’s growth patterns remind me of Java moss. It’s very thin though. It likes to attach itself to gravel. And it doesn’t spread very quickly. Anyone know an ID for this, and how to get rid of it besides just manual removal?