What is this type of algae and how to remove and prevent it?

[LHAquatics]

Please help me out

 

[Fishfur]

Do you mean the discolouration on these leaves?

 

[LHAquatics]

Its kind if hard to see but its on the edges of the plants. Its a dark green and it curls up

 

[Fishfur]

Going mainly on the colour it appears to be, it looks like cyanobacteria but the way it’s growing is odd if that’s what it is.

Is it very soft & slimy to the touch? Does it rub off easily?