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When placed in the aquarium, the holiday block gradually dissolves, releasing food particles (typically small pellets) into the water over a set period, typically ranging from a few days to a couple of weeks. If you're planning to use a holiday block or an automated feeder it's a good idea to test it in advance to ensure it suits your aquarium's needs.

The longfin zebra danio is a captive-bred aquarium fish and has long, flowing fins and a long tail, about three times the length of the common zebra danio’s fins and tail. In the aquarium industry, zebra danios are found in a range of colors, with silvery-green, pink, blue, and purple bodies.

Herein are listed the top 5 best aquarium external filters for 2025, based on Real Aquatics 2024 sales and reliability data from Real Aquatics outlets on eBay, Amazon and official websites.

The list consists of both external and hang-on filters only, and does not include variations such as internal filters and sponge filters - these are featured in separate awards.

The beginner stage, where you do not know much about fishkeeping but are eager to learn. From a supplier's point of view it is here where the most careful management must apply, and for the buyer the realisation that being a serious fishkeeper means you need to be responsible.

Preventing blackbeard algae involves maintaining balanced lighting, nutrient levels, and CO2, as well as quarantining new additions to your aquarium. Blackbeard algae, also known as brush algae or Audouinella, can be quite a nuisance in aquariums. Here are the primary causes of its growth.

Healthy aquarium water should be well oxygenated, and the easiest way to achieve this is by adding an aerator to your fish tank, usually in the form of an airpump and air stone or by venturi pipe on your internal or external filter outlet pipework.

Dive into a breathtaking underwater world as we showcase mesmerizing goldfish swimming gracefully in a vibrant aquarium! With their stunning blue, orange, and black patterns, these beautiful fish bring a splash of color to their lively habitat, surrounded by lush aquatic plants and decorative ornaments.

Watch as vibrant green moss balls gracefully float and bob in a serene planted aquarium, creating a hypnotic visual experience. The delicate movements of cherry shrimp add a lively touch to the scene, showcasing their vibrant red hues against the lush greenery.