you just have to be careful. they have many that look more like aquatic plants then that crappy plastic ones out there.
i use live plants. they should have some with out any metal in there but if there is you can remove it too.What do you do with the plants you buy at Michaels? Do you do like dkpate and remove the metal (or is there metal in them?). I have a Michael's not too far from my house - I'll have to look on the way home from work today.