Best for Betta: Penn-Plax Cascade Hang-on Aquarium Filter. Best Budget: Marina I25 Internal Filter. Best Canister Filter: Zoo Med Nano 10 External Canister Filter. Best Sponge: AQUANEAT Aquarium Bio Sponge Filter. Best HOB: AquaClear Fish Tank Filter. Best for Planted Tank: Aqueon QuietFlow LED PRO.

UV filters use ultraviolet light to kill harmful microbes such as algae, bacteria, and parasites. The job of a UV sterilizer is to prevent pathogens from outbreaking diseases in an aquarium, and keep water from getting cloudy or greenish. So yes, UV filters are overall beneficial for your fish’s health and wellbeing.

We recommend getting a pre-filter sponge if you are planning to breed fish and/or have shrimp. The sponges also provide other benefits such as keeping debris from getting into your filter and offering a lot of surface area for beneficial bacteria. Coarse sponge pre-filter are better in terms of water flow and require less cleaning.

The filter is the life support system for your tank and keeps it looking crystal clear. If it’s allowed to grow clogged, fish health will suffer. As a rough rule of thumb, mechanical and chemical filter media should be changed every few weeks. And biological filters never get changed; just rinsed if they grow so clogged they impede water flow. The purpose of the filter on your aquarium is to remove excess food, decaying organic matter, free-floating particulate, dangerous chemicals, and the fish's waste products from the water. The fish excrete waste constantly as they swim around in the water. If this waste is not removed, the toxins that the fish are removing from their systems
Therefore, you must clean out or replace your mechanical filters on a very regular basis. In most cases, filter pads, socks, and floss will need to be changed every 3-5 days or weekly at a very minimum. Filter sponges should be rinsed clean on a similar routine. If you wait until the filter material is completely clogged, you have waited too long.
Ammonia is most likely to occur when the fish tank is first set up or each time there’s a water change. When new water enters an aquarium, biological colonies begin growing to filter toxins in the water. If these colonies do not grow fast enough, there’s a high chance ammonia levels will rise. And then, there’s tap water.
As we mentioned above, you cannot over-filter a fish tank, but if you introduce the wrong filtration systems to your tank, you could create too much current. Filters that are too powerful for your tank could stress out your fish or keep aquarium plants from taking root. In the worst-case scenario, weaker fish could be sucked into your filter.
This filter has a compact design that can fit under most aquariums. It has a 106 GPH flow rate and a 3-stage filtration system that includes mechanical, biological, and chemical media. It is easy to set up and maintain, and it comes with all the necessary accessories. It is suitable for tanks up to 40 gallons. fGyK.
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    • do fish tanks need a filter