This is the first summer for us with our pond and it has been unusually hot. Pond is about 650 gallons....all plants are new this spring (early June) We have either 4 or 6 gold fish (2 are feeder fish so not sure if still around). The water is green and we have been advised by sales people at pond/pet businesses to add numerous chemicals to clear it and nothing has worked so we are contemplating adding a UV clarifier. We have had the water tested numerous times and told it was okay....there is no string algae. We have a bio-falls, skimmer with a 3000 gallon/hour pump, an inline iogen 2 ....also we have 2 bubblers. Your advice please. Hope you can see the green water in this photos.