Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
How many gallons is this shallow tub?
Golds need a LOT more room than a foot deep. They get to 6" plus the first year, and can reach a foot in the next few years. My Golds are not even 2 years old and are in 150 gallon pond, 2' deep in the deepest part.
The smaller fish might be OK in there for oxygen/CO2/waste, but there are other issues:
Predators can very easily catch fish in that shallow a container.
It will both over heat and evaporate in the summer.
It will freeze in the winter if you are in a zone that gets that cold. I am in zone 9b and my dogs' water bucket freezes over at least once through the winter. (Yes, bring the fish in, and select plants that go dormant in the winter, and lift them out of it).