I've just noticed that very dense areas of my Water Sprite have a white,
fluffy, cotton wool like growth attached to them. These areas are so
dense that fish cannot reach them and water flow is very limited. I've
pruned some of the areas.

I presume that if I prune the Water Sprite until water flow improves
again that the fungus type growth will go away?

Anyone know that reason for this growth?

Nikki