I just bought a home with a pool. The neighbors' tree branches over the pool. It doesn't look like the pool has been opened in a year and a half. Vacuuming and skimming have yielded...leaves...lots of leaves. I'm curious as to whether leaves are simply a nuisance or if they can cause algae or help algae grow? I don't want my first order of business to ask the neighbor if I can trim the tree, but I will if I have to.