Jan 20, 2011 #1 P Picaso Aquarium Advice Apprentice Joined Jan 20, 2011 Messages 17 What's this White stuff on my LR looks like it filters water and travels around in lines ??? Attachments image-2162509480.jpg 62.6 KB · Views: 92 image-4051000007.jpg 62.6 KB · Views: 81 image-395772768.jpg 63.4 KB · Views: 96