I have a pond that came with the house.It sits underneath a grove of redwoods. It is kind of last on my "to-do" list. We get 80" of rain annually so I never fill up the pond. However. the water is al,ways a rust clor and I assume that is from tannics from the redwoods. I plan on putting a pond \net over the top. I am hoping this will alleviate problem. Are there any other solutions that will solve the problem without covering pond up all the time? I would like to also install a bog filtration hat will need to be covered, Will plants survive under cover?