Sir Nathan XXI said:
Jonas I too have the same annubis plants, my Ps dont bother them much but occasionally bite it as well, I really like live plants though, my piranhas like them much better than fake for cover and food
Yeah, those anubias are perfect for tanks with little light. And since their leafs are pretty thick, they can take a beating.
I'm lucky to have one "mother plant" which grows really fast (in general, anubias are very slow growing plants), so every time I need a piece of plant for somewhere else, I just break off a little piece, plant it elsewhere, and it does the rest.
Java Fern is also highly recommended for piranha tanks: low light requirement, but still a fast growing plant. Besides that, I read somewhere that it is slightly toxic to fish, and for that reason won't be touched.
And I agree, a tank with lots of live plants looks ten times better than one with fake plants or no plants at all.