Cracks in concrete or tears in liners can be repaired but it is rather time consuming and obviously a problem worth avoiding. Properly mixed concrete should not crack even in severe weather conditions. We find that most tearing in lining material is due to improper selection of the correct pond liner prior to installation, other reasons are the dreaded visits from herons, otters and the like whose sharp claws can easily penetrate weaker pond lining.
Green 'scummy' water is a common problem with smaller ponds. A certain amount of algae is present in all water, however during longer periods of sunlight even a perfect balance of fish and plants is not enough for prevention and the water turns a livid green colour. In small still water ponds this can be overcome with the installation of a filtration system including ultra violet light clarifiers. The U.V. light kills algae cells when passed close to its spectrum, whilst the filtration unit removes this dead organic matter before being systematically returned to the pond to cause more problems.
Provided that your pond fish are not overfed and the water is well oxygenated, they should remain healthy. But if you do notice fish acting out of character or swimming too lethargically then we suggest you contact your local fish professionals. Lumps and bumps or skin lesions are obvious signs of distress and should be treated as soon as is possible. Again, a quick call to your local fish pond care people to request the correct diagnosis and treatment should suffice to save your pond fish.
Late autumn and winter are not the best times of year to give your pond a thorough clean, since you will probably disturb all the plants and fish trying to acclimatize themselves for the winter months. Some plants even send down buds to the bottom of the pond where they lie until the weather becomes milder. The best time for a good clean up is in spring, after the last frosts, when pond life is back in full swing and the fish begin to feed actively.
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