Jelly like substance
The surface of my wildlife pond is covered in an orangey/green jelly like substance. It is covering a fair amount of the whole surface area. I was going to skim it all off but thought I'd better seek advice first. Plants underneath the surface don't seem hindered by it. What is it and what causes it? It is extremely heavy and when I took out a net full to leave by the pond for critters to get out, it just flopped right back in! There has been no chemicals added, filled only with rain water. I am off on holiday for a month next week so if it needs doing, I'd like to get it done before hand. Thank you all in advice. My pond is now coming into it's 3rd year.