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Aquarium Water Changes

Large fish like this arrowana need regulara water changesChanging water is essential in all aquariums. Even the most densely planted and lightly stocked aquarium will have a gradual build up of nitrates, which will eventually stress and kill the inhabitants. Furthermore trace elements within the water will be depleted.

Ideally a tank will have 10% of its water changed every week, or 20% every two weeks. In small, overstocked, overfed or tanks with messy inhabitants (piranhas, oscars, other carnivores) more water changes will be necessary. Likewise understocked tanks full of plants will not need so many.

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First unplug anything electrical - heaters, filters etc. Water and electricity do not mix well. Water changes should be performed with a syphon (like the ones advertized on the right); making sure to remove debris such as uneaten food, dead leaves and the mulm that builds up at the bottom. Syphons can be simple tubes which are started by sucking one end, or immersing the whole tube, capping one end with a thumb, then taking the capped end out and into a waste bucket. Remember old tank water is full of nutrients and great for plants both indoors and out!

The new water should have similar qualities to the old water, particularly temperature and hardness. If you are attempting to change some parameter, try drip-filling the tank. This is done by slowly syphoning in the new water with a piece of airline over an hour or so.

The first sign that water changes are overdue is the presence of algae. Algae occurs when there is an excess of nutrients in the water. When the water has got really bad the fish will often be seen hanging around the surface 'gasping' for air. If you see this immediately do a large water change, and investigate whether your filter is working, or a large inhabitant has died.








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Fishkeeping Facts and Tips

Cichlids? There are estimated to be over 2000 different Cichlid species in the wild, of all sizes, shapes and colours. Many require very specialist conditions such as those coming from the sandy/rocky waters of Lake Malawi and Lake Tanganyika. Others, such as the Apistogramma dwarf cichlids from the Amazon basin require softer water and a well-planted tank. In general cichlids do not make good community fish as they can get quite aggressive, especially when spawning - but a specialist cichlid tank is certainly a sight to behold, and can be very rewarding for the more experienced aquarist


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