They won't react at all, because fish need to be placed in room temperture water every time you change their water.
Room temperature.
Vanadium does not react with water at room temperature or normal conditions. However, it can react with steam to form vanadium oxide and hydrogen gas.
Beryllium doesn't react with water at room temperature.
Silver does not react with water at room temperature. However, over time, silver may react with water and oxygen in the air to form a thin layer of tarnish.
Nickel Doesn't react with water under normal conditions
Sodium reacts with water at room temperature (even at lower ) and produce hydrogen gas , 2Na + 2H2O = 2NaOH + H2
The most common set of metals that react with water at room temperature are the alkali metals, namely lithium, sodium, potassium, rubidium, cesium, and francium. while these metals react quite violently with water at room temperature, many if not most other metals have some sort of reaction with water at room temperature (IE, iron rusting in water)
Under normal circumstances boron does not react with water.
Uranium don't react with water at room temperature; strontium react with water and the hydroxide Sr(OH)2 is formed.
it depends on what type of fish.a goldfish has to be in room temperature water.
Generally beryllium is considered as an alement which doesn't react with water at room temperature.
It is true that alkali earth elements (those in group 2) react with water. When reacting with water, they form the metallic hydroxide and hydrogen gas. An example might be Mg + 2H2O -->Mg(OH)2 + H2(g)