I have a 30-40 year old weeping willow close to my natural pond who’s roots have turned into humongous mats inside the pond along the bank. I can pull the mats up in huge clumps and pull them out, but I have no idea if the mats are good for the wildlife habitat frogs, snakes, baby fish etc or it is a detriment. It is also a collector of algae that sits on top. I do not want to kill the willow. Any advice would be greatly appreciated.