Best filters for 3/4/5 gallon aquariums and small Betta fish tanks

What Is the Best Fish to Keep in a Fish Bowl? | PetHelpful
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This is probably the best filter for small fish tanks in the market. It is rated 20 gallons and can filter up to100 gallons of fish tank water in an hour. With that speed of filtration, the Aqueon QuietFlow 10 Power Filter can keep the water in your 10 or 15 gallon fish tank crystal clear and clean. It combines enhanced filtration capabilities, industry high flow rate and ultra quiet operation to provide premium quality solution for your fish tank. Its in-tank pump design not only lowers the overall profile of the unit, but also eliminates the need for priming. It has double biological grids that allow for growth of beneficial bacteria as well as easy to replace cartridges that make maintenance of this unit easy.
Learn which tankmates to choose for your Betta fish in a small aquarium or community tank environment for the best chance of success.
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#9: Cherry Shrimp
Okay, small freshwater shrimps in the genera Neocaridina and Caridina obviously aren’t fish! But they do bring a quirky splash of color to the small aquarium, and they can perform a useful role as combination algae eater and scavenger. Some are red and are called by such names as cherry and crystal red shrimps. These are small (around an inch long) and work extremely well alongside fish of similar size. They are sociable and best kept in groups. Aside from algae, they will eat scraps of fish food as well as decaying organic detritus and various microorganisms. They seem to do best in moderately hard water with a neutral to slightly alkaline pH.
In the solid red species, juveniles and mature males are transparent with a few red markings, whereas mature females are red all over. Under good conditions, cherry shrimps breed freely. Females will carry bunches of eggs under their abdomen for about two weeks, at which point the eggs hatch and a few dozen miniature shrimps will emerge. In a planted tank with lots of hiding places, at least a few shrimps will survive to maturity. A big lump of Java moss seems to suit cherry shrimps perfectly. Not only does it give the juveniles cover and the adults somewhere to molt safely, the moss also traps algae and small particles of food. The shrimps will congregate on the moss and graze away contentedly.
Their growth rate is surprisingly rapid, with shrimps reaching maturity after only a couple of months. Look after your cherry shrimps properly, and you’ll soon have quite a colony to share with your friends. Maintaining a 10 gallon aquarium is hard but if you do decide to start a 10 gallon aquarium, then you should know the best fish for your small tank.
Photo provided by FlickrThis peaceful fish does best in small schools (around 6 in a tank) where the flashing colors of their bodies together make for a brilliant display
Photo provided by FlickrMar 18, 2017 - Learn which tankmates to choose for your Betta fish in a small aquarium or community tank environment for the best chance of success.
Photo provided by Flickr
One thing that you should consider when you start your new nano reef tank is the choice of small saltwater fishes that could be best suitable for your tank. Keep in mind that the fish species should not be aggressive and the choice of fish you choose to stock is compatible with each other.20-gallon (76 litre) tanks

Tanks this size are ideal starting points for anyone entering the hobby. In the United States 20-gallon tanks are available in “tall” and “long” varieties. The tall tanks measure roughly 24 inches in length and 17 inches in depth; the long tanks are 30 inches in length and 13 inches in depth. All else being equal, the long tank is better. Long tanks offer more swimming space and have a greater surface area to volume ratio, meaning oxygen diffuses into the tank at a faster rate. You can keep more fish, more happily, in a long tank than a tall tank.
Do tall 20-gallon tanks have any advantages? Not many. They are perhaps a bit easier to decorate with tall plants and rocks, and having a smaller footprint they take up less space on a tabletop or shelf. Greater depth does work better with certain small but tall fish, in particular domesticated angelfish. But beyond that, these tanks are far inferior to long tanks for general fishkeeping and are best avoided by less experienced hobbyists.

Species useful in 10-gallon tanks will do even better in a 20-gallon tank. In the case of things like small tetras, you can keep larger groups. If you have a nicely planted aquarium, consider keeping two dozen neons for example. Otherwise some of the additional species you can sensibly keep in a 20-gallon tank include the following:Considered one of the best starter fish, Pajama Cardinalfish is among the most commonly bought fish for nano tanks for they are cheaply priced and remain small even until their adult form. These fish aren’t also picky when it comes to food and would generally feed on anything you put on your tank. Also, they are characterized by their bold patterns and their mouth-brooding features – their tendency to carry their eggs inside their mouth before the eggs hatch.Finding the best fish tanks for beginners is not that easy and that’s because taking care of fish isn’t that easy in general. That’s why getting a good fish tank is important because if you are new to taking care of fish, you will want something small with a good filter, some lights, and easy access too. You might think that all fish tanks are the same, but that is not really the case.