- Is the tank glass or acrylic? Almost all new glass aquariums will get brown algae (diatoms) that use the silicates that leech out of new glass to build tiny crystal-like shells around themselves. They go away eventually.
- Is she doing regular (weekly) water changes and gravel vacs? Uneaten food, fish waste, etc will build up and look nasty if it's not removed.
- Some algae is to be expected. Different algae can indicate a healthy vs unhealthy tank. Considering that the tank doesn't seem to be getting too much light if the algae is green I would be concerned about the water quality.
How long has the tank been set up?
Do you have the ability to give us any water parameters like NitrAte levels?