Aquatic plants dying due to unknown reasons

Since vandalism by miscreants has become widespread in panaji, goa, as they enter the house with duplicate keys, the aquatic plants purchased online were kept in different locations so that a location specific problem would not destroy all the plants. It is found that the Salvinia minima are flourishing at one location in panaji, goa, while they are dying quickly at another location in the same city. In both cases, tap water is being used , however almost all the plants have died, while in another area, they are flourishing and new leaves are visible.
A similar problem is faced for Azolla caroliniana and Duckweed.
Any solution to the problem will be appreciated