I just wanted to make sure Philodendron is safe in the same system with edibles. I have an existing koi pond (no koi at the moment) that has Philodendron in it. I've started tomatoes, cantaloupe, chives and marigold in containers. My Grandson and I are planning to build the system over the next few weeks as a way to make learning gardening fun for him. If Philodendron doesn't mix with edibles, I can pull it out and drain the pond.