The short answer to this question is yes GloFish will need a filter. If you plan on keeping GloFish in a small fish tank we recommend you get a sponge filter (Amazon Link). For larger aquariums the Aqua Clear Power Filter (Amazon Link) would be the best option. This includes the time it takes to remove the water, clean the gravel, and refill the tank with fresh water. Of course, it does depend on the size of the tank and how long it’s been since you last cleaned it, especially if you need to trim some plants. Generally, it shouldn’t take more than 30-60 minutes maximum. A medium to large tank with multiple fish should have the water changed once a week. The larger tank size will provide more space for the fish, but there is more to balance with algae growth and nitrates. 3. How Much Water to Replace. Changing too much water too fast will harm the delicate ecosystem within the tank. Our pick for the best small canister filter is the Fluval 107. Whilst it’s a premium filter, and that’s reflected in the price, because it’s external it means it won’t take up any space in your small fish tank. Having said that, at 7.5 x 7.0 x 13.7 inches it’s pretty compact for an external filter too. When you don’t have a filter in your tank, it’s not uncommon to need to change the water every 2-3 days. This can quickly become time-consuming and tedious to you, not to mention the fact it’s going to stress your goldfish out. When you’re constantly adding and removing water from the tank, the act itself is going to stress your Written by: Tammy (@aquarist_tl) and Team Buce Plant If you could change one thing about the aquarium hobby, what would it be? A common answer might be: the need to do water changes. While some find tank maintenance therapeutic, others may see it as a hassle. Especially those that have multiple planted fish tanks. Having to drain and fill many aquariums every week can take up more time than we Aquarium sands and other substrates can also be used to improve the chemistry of the water. For instance, if your fish require hard water, limestone gravel or a coral substrate can help you achieve the correct hardness and alkalinity levels. Moreover, substrate can provide a safe home for fish eggs. Larger-sized substrates allow eggs to drop Article Summary. Without a working filter, dirty water can harm your fish’s health and happiness. The top recommendations for 40-gallon tank filters are the Penn Plax Aquarium Cascade 700 Canister Filter, MarineLand Magnum Polishing Internal Canister Filter, and Fluval 207 External Filter. It’s advisable to use all three types of filtration .

do fish tanks need a filter