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I recently added a bunch of artificial plants to my 20 gallon tank. I have a school of 6 neons that live in there, and before I added the plants, they stayed together pretty peacefully. Today, I noticed that they now split off into groups of 2 or 3 and get nippy with eachother. Is it because the plants block their line of sight and cause them to get "lost?" I'm not sure why that would be, since there's a large open space at the front of the tank... Anyways, do I need to remove these plants?