I have a 300 gallon stock tank that I'm keeping as a
quarentine/hospital tank in case my pond fish need it. I'd like to
put some plant shelves in. Is cedar or other regular wood okay, or
might these contain substances that would be toxic to the fish?

Thanks.

I use plastic letter crates that you can buy at
office supply stores or Wal-Mart or Target
etc. I haven't noticed any problems for my
goldfish, minnows or plants.

You can also turn plastic nursery pots
upside down, but I don't find those as
stable (smaller "footprint" than the crates)
and have had some plants fall over.

Gail

Those are good ideas, thanks. The problem is the depth of the pond.
(see other reply in this thread.) Any thoughts about whether painted
metal plant stands might be safe for fish?