Well.. it's as heavily planted as it appears to be.. the angels take no crap from anyone. The tigers nipped at the large male veil tail for a few days when I first got them, but after about five days, he chased a couple of them down into a corner and I honestly thought he was mad enough that he might just eat one of 'em, but he let them off with a warning. lol I've not once seen them chase either of the angels since then. Not even a little bit. I think I added the barbs to that tank two years ago. However, my two beloved angels in that tank deserve better (more space), and I think I may set up a 40 just for them next week. Then that 33 can belong to the tigers and the loaches.