I have a small pond in the north of Spain. I am a complete beginner in forums and in ponds and I will probably make mistakes in English, so please be patient with me. My pond gets filled in with water from the rain. Now the water is very green which I quite like but it in the surface ther are thousands of what I think may be mosquito larvas. I have got rid of some of them with a net. I am worried in case I get an invasion of mosquitos in my garden. I have heard there are some tablets that they use in America that are disolved in the water and kill the mosquitoes but not the little frogs. Has anybody heard about them? Any other advise? Thanks in advance.