My pond is going to be green and I think it is algae. So, I need the chemical to treat my pond which should not kill my fishes and give me instant result. I want chemical treatment because chemicals gives quick and instant result. If I will do some natural process, it will take time and I want instant result.

Please suggest me.

You can't just pour chemicals into your pond without permission from your town. All water is connected to all other water around you. Also, chemicals against algae are only temporary, and it's far better to work on natural ways. All small bodies of water go through a process of stagnation and there really isn't a lot you can do about it without a stream coming in and going out.

But Natural ways takes more time to eliminate algae and till time it can effects my fishes.Thats why I am asking chemical for fast treatment. Chemical will give fast treatment as compare to natural ways. But , yes in future I can follow the natural ways to take care of my pond.

So, please help me...

Your local home and garden store can best guide you to a proper solution for your area.