I recently went through and cleaned out all my old aquarium supplies. I have 5 plastic plants still in good shape that I washed with mild dish soap and water. Are these safe to include in enclosures for tortoises/box turtles? Obviously, not keeping them too close to any heat sources so they can't melt. I see people talk about silk plants frequently, but rarely plastic...and I don't know if it needs to be a reptile safe plastic or anything? Thanks!