we didn't have leeches for 8 years....I assume they came in on a goose or duck. It's a completely closed pond...how else would they get in? I'm hoping for another 8 years without leeches. so assuming I have too much copper in the pool, do I even other adding the bacteria? or do I keep adding weekly? I assume adding any Algaside at this point to clear the water will only make things worse...?