Hair Algae

Hi Sue and all, haven't been of for ages, all is going well with my tanks at the mo, but my sister has two Fluval Chi 25L tanks, with a Betta in each, she has a problem with what we think is green hair algae, any suggestions on how to combat it please : )

Hi Sanjo, hope all's well with you and the fishes : )  Sorry i was too lazy to look through the posts, i will check yours out too : )

Mine is short stuff and a nasty colour.
Grandson told me the other day that his plant  (Cabomba I think it was) was doing well.
When I sneakily checked his tank I was horrified as the "plant" was filling the tank and the fish were squeezing passed it.  I advised him to get it out pronto as I was sure it was hair algae.
No nan,, the fish love it, they are all eating it.
It's true it was a really lovely fluffy green but it was everywhere and not a sign of the original cabomba

Well he's 18 so I backed off, after all, what do I know, I'm a newcomer myself

A week later I had another look at his tank and was surprised to see it much emptier as he had decided to take my advice and remove it.  He said it stunk and he reckons he must have left little bits behind as it is growing again.
On the other hand I suspect he leaves the light on all day. I've "advised" him it's not a good idea but......

Now, if MY algae looked like ,y grandson's I'd probably jut try and keep it under control since, compared to what I have, it looked very attractive.

Since I had the bigger tank (where the problem is) it is more or less in the same place as the smaller one was but in my wisdom I thought I could utilise the natural light from the patio doors for most of the day so have swung the cabinet around and one end is more in the light. If the sunlight was too strong I covered the glass at the end.   It is that end that started with the algae. 
It began in my "tree" made from an applewood branch and covered with Christmas fern.  The grey/green fuzz is on the fern.

The reason I suspected the daylight is because the same fern is on the trunk of another bit of wood further away from the light and that stayed green.  It is now creeping onto my java moss cave.

There isn't a massive load like my grandson's but I'm disappointed that my lovely "green" tree now looks messy.

What with that the the Hydra appearing in the small tank I'm getting a bit fed up