I have a tank that had high nitrates. I got the nitrates down to a low level and with the exception of my back glass, just about all of the green algae is gone. This just popped out of one rock that has been in tank for 5 years. Just that one rock has it growing. It is now about 3" long and, honestly, very colorful and looks nice waving in the current.
I'm just wondering what it is and am I looking at any problem by leaving it continue to grow. View attachment 14179
I'm just wondering what it is and am I looking at any problem by leaving it continue to grow. View attachment 14179