On the contrary. As you have to cut them to use them for a fish purpose anyways, an IBC pond would be exactly as deep as you cut it to be. If you have the caps, you could cut two 40 inch by 48 inch by 10 inch deep aquaponic trays, which would look suspiciously like really shallow ponds! Or cut it in half and it's two 24 inch deep units. Half buried and then half camoflaged with some wall stones or something? Could be fun.
So what would be a good rule of thumb for the depth compared to surface area?
I am planning to do a small balcony "pond" with an unused clear plastic garbage "can" that can hold about 20G, but I am worried that not enough light will reach the bottom for sustainable plant growth.
If you're using it to grow plants, it's too deep. If you want to put fish, (goldfish only, not big enough for koi) the tank is fine as it is, providing you have a shower to aerate the water and get rid of Ammonia, NitrItes and NitrAtes.
If you cut them in half, 2' deep, it is a magnet for ***** and birds to get your fish. It is also too shallow for temp stability.
I know many people who use them for small ponds or to raise Tilapia.
It all depends on what you're putting in the pond.
Some plants, most, don't do well in water over 1.5-2' above the top of the pot. There are some lilies that will grow like crazy in 4' of water.
Goldfish don't need much water to swim in but the more water, the more stable the parameters.
Koi need a minimum of 250 gallons per koi.
If you have predators, they can and do stand in 2' of water to fish.
It all depends.
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