i have a 4600 gallon koi pond which gets full sun most of the day and had to change the water this week and already the yellow green algae is blooming we have floating plants that have to be thinned constantly which generate alot of debris but provide shade .considering algae eating fish i have a couple of 15 " pecostumis i could tranfer from an indoor aquarium. but they are part of the tanks best features maybe i should just buy a bunch of little ones and let them have at it what do you think,looking for a nonchemical solution in the virgin islands thanks.