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Interesting comments mark. As you suggest, alot of the UK and USA hobbyists are used to UV lights that are part of the plumbing and are submerged. Usually they come at the end of the filtration just before returning to the pond. Theory being that you do not want to kill any bacteria from the pond going into the filter, yet you do not want to have
anything from the filter going back to the pond.
Yet we know as you have stated the dealer Momotaro uses his suspended lights over the settling sump ( as do alot of other Japanese hobbyists)
Addressing the problem as presented
lethargic koi and green water, my head is thinking incomplete filtration
hence the appearance of the algea. Either his present filter is not is not big enough for the koi load or designed/operated efficiently.
so....Kiky please help us with more specific info
size of pond in gallons
fish load
water parameters, PH amonnia, nitrate, nitrite, Gh, KH
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