Tiah has a fish tank as the water evaprated she should add more noticed line of white scale on inside where had evaporated explain your observation?

The white scale seen on the inside of the fish tank where the water had evaporated is likely a result of mineral deposits left behind as the water evaporated. When water evaporates, it leaves behind any dissolved minerals it contained. In this case, the minerals likely deposited as a crusty, white scale.

Several minerals can be present in tap water, including calcium carbonate, magnesium carbonate, and sodium bicarbonate. When the water evaporates, these minerals are left behind as a residue. The specific minerals present in the white scale will depend on the composition of the tap water used to fill the fish tank.

It's common to observe this phenomenon in areas with hard water, which has a higher concentration of dissolved minerals. As the water evaporates, the minerals become more concentrated, leading to the formation of visible scale deposits.

Possible solutions:

* Regularly replace a portion of the evaporated water with fresh tap water to dilute the mineral concentration and prevent scale buildup.

* Use a water filter or softener to reduce the mineral content of the tap water before adding it to the fish tank.

* Clean the white scale deposits from the tank using a vinegar solution or a commercial descaling product specifically designed for aquariums.

* Avoid letting the water level get too low in the tank, as this will increase the evaporation rate and worsen the scale buildup.