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

10 Best Freshwater Aquarium Fish For Beginners | Home Aquaria
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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.
Best Small Aquarium Fish
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#4: Kuhli Loaches
A number of different species of Pangio are sold as kuhli loaches, though the most commonly seen is probably Pangio kuhlii, a worm-like fish that is 3 to 4 inches long, with a pinkish-orange body ringed with thick chocolate-brown bands. Their natural habitat is the leaf litter at the bottom of streams, where their coloring helps them to hide from predators. If such discretion doesn’t work, these loaches are armed with sharp, erectile spines in front of their eyes that make them an unpleasant mouthful.
Because kuhli loaches are small and hardly swim around at all, they can be excellent fish for the small aquarium. They usually slither around the bottom of the tank looking for morsels of food. Unlike most other loaches, kuhli loaches are completely peaceful and need the company of their own kind. Keep them in groups of four or more for best results. Kuhli loaches make excellent community fish, and will happily feed at night on things like catfish pellets and bloodworms.
Mature females are remarkably robust and quite a bit longer than the males, but for whatever reason, this species very rarely breeds in aquaria. They are otherwise easy to keep, except for a tendency to find their way out of uncovered tanks. Best Small Fish Aquarium
Photo provided by FlickrLearn 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 FlickrMaintaining 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.
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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:Best Fish For Nano, Micro And Small Aquariums

These are the best fish in my opinion for small and nano aquariums. The fish in this video are:
Badis, Killifish, Micro Rasbora, Pygmy Corydoras, Ember Tetra, Sparkling Gourami, Endler Guppy, Clown Killi / Banded Panchax,

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