If a fire destroys a Flow Battery installation I doubt there is...

If a fire destroys a Flow Battery installation I doubt there is a lot of daylight between the environmental damage caused by a leak from melted Redflow battery compared a leak in a melted VSUN battery. Any chemical compound in high enough concentrations can damage the surrounding environment.

Some info on Vanadium in the environment is below.
I'm sure there are problems with Bromine being released in to the enviroment as well.

But truly a discussion about which is better in the random low chance risk of a fire and a chemical leak is a distraction.
Both companies and their respective chemisties are worthy being part of our energy future. Both chemisties are a far better solution than a lithium bomb that is difficult and costly to recycle.
If you care to DYOR you will figure out which company is further ahead in commercialisation.
As I said, I'm invested in both.
There is plently of room in the market for both companies.
So which ever succeeds, I will benefit . If both succeed, I benefit even more.

Vanadium (V) - Chemical properties, Health and Environmental effects (lenntech.com)

Effects of vanadium on the environment

Vanadium can be found in the environment in algae, plants, invertebrates, fishes and many other species. In mussels and crabs vanadium strongly bioaccumulates, which can lead to concentrations of about 105to 106times greater than the concentrations that are found in seawater. Vanadium causes the inhibition of certain enzymes with animals, which has several neurological effects. Next to the neurological effects vanadium can cause breathing disorders, paralyses and negative effects on the liver and kidneys. Laboratory tests with test animals have shown, that vanadium can cause harm to the reproductive system of male animals, and that it accumulates in the female placenta. Vanadium can cause DNA alteration in some cases, but it cannot cause cancer with animals.

Read more:https://www.lenntech.com/periodic/elements/v.htm#ixzz6zo9UBWNn