My fish are atop the water gasping for air it's 87 right now @ 9 pm and got up to 102 today. There is a fish mate UV Bio Filter running on a Beckett 900 and also a Pond master 950 running the skimmer and diverting into the pond. Pond is 8x6 less than 700 gallons. There are 10 fish in there comets/sarassa's.