I have a 4,000 gal pond with straight sides and no shelves. I have 3 koi's and I want to put some plants in the pond. I have tried the crates all talk about but I had one get caught in the holes of the crate and lucky enough I got the koi out without being hurt. Three ago before I had my pond, I saw a pond that had many plants in the pond but they were on plant stands and the koi couldn't get into them. Do they make them anymore and if so anyone know where or the name of them.