Planted Tank Guru
Join Date: Dec 2012
Location: Hot Springs Ar. 71901
That is the only regular pet shop fish that will actually benefit from some salt in the water as it's a brakish water fish. Perfectly OK to keep them in freash however.
Can't tell from the picture if it's staghorn or Cladophora algae but Mollies like softer types of algae. They might eat some of it but no gaurantees.
The size of the tank matters also as they like wide open spaces and when I kept some in a 10g tank they constantly ran up and down the front glass looking for more space to occupy/roam in.
If your tank is 29g or more they make a nice schooling fish though so no harm in trying a few.
The shortest distance between any two points is a straight line...in the opposite direction...