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Thanks JR. I don't have a source of RO water so I wonder whether rain water would do, or perhaps water that I've already treated with acid in a separate container to get the KH down before I add it. What do you think would be best?
The reason for the plants is that I was using them to keep the nitrates down. I never fertilized them as they grew very strongly from the nutrients in the water. Some months ago I introduced the K1 as part of the filter system which apparently keeps nitrates down (aswell as the ammonia and nitrite of course) and then removed the plants to avoid the sludge buildup problem. I have another pond which has been running K1 only for 3 years and nitrate is also 10ppm so I figure that might be about as low as it'll go with K1.
The fish are fine. The fish with the really bad hikkui you saw in the pic is the most eager feeder of the lot and was a toby in its spawning. It is always the first to get to the food and is very tame and docile. I have spawned with her twice in the past couple of years and now I'm not sure I should be keeping the babies. I have 10 fish in the pond ranging in size from 40 to 60cm, average length probably around 50cm.
I'll send you a pm about the lines.
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