However, the wood contains tannins that leach out into the water, staining it the colour of cold tea and lowering the pH level slightly.Īlthough a “blackwater” environment might look unsightly, it’s actually not detrimental to your goldfish, as long as the pH level doesn’t get too low. You can train certain plant species to grow on pieces of wood, and your goldfish pets will enjoy grazing on the colonies of algae and beneficial microbes that grow on the wood’s surfaces. Bogwood and Driftwoodīogwood and driftwood make attractive fish tank decorations and work well in a goldfish setup. If you need to change more water than that, always add a filter-boosting product to the water.Īlthough it’s rare for a goldfish tank water to turn brown or yellow, that occasionally happens. You can stay safe by changing around 20% to 25% of the tank water each week. Removing too much water kickstarts a mini-cycle, causing bacteria colonies in the tank and filter media to repopulate. Only turn the system off briefly when you’re carrying out routine maintenance, such as changing the filter media or performing partial water changes.Ĭhanging too much water in your goldfish tank can accidentally trigger bacterial bloom, which can upset the aquarium’s eco-balance. You need to have your filter running 24/7/365. You can accidentally trigger bacterial bloom by turning off your filtration system overnight. If your goldfish tank is newly set up and your water turns milky-white after a couple of days or a week, the phenomenon is probably due to bacterial bloom.īacterial bloom happens when a new biological filtration system is still maturing.
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