I'm thinking what type of chemicals they use to make the fake plants. As long as there is no toxic substance involved, it should be OK. I really don't have experience with the plants they have a Michaels Crafts Store, but I have used the plastic plants in the past, and it is tuff to put in tanks that have fish that digs them up. Also, when the algae sticks to it, it is hard to clean. But now that there are hi-pressure hoses, it is probably easier to clean it now. I just hated the plants floating back into the surface after just re-planting them.