You may keep 1 male and 2 female Neon Stiphodon Gobies in a 20-gallon tank. That being said, here are some of the best micro fish for a small 5-gallon tank: Small fish tanks may occupy less space, but they come with some serious inconveniences. In my observation, high water current tends to stress Pygmy Hatchetfish. These minnows will thrive in fish tanks that maintain a temperature range of 59 to around 71°F (15 to 22°C). Ian. They possess somewhat transparent bodies for which they are sometimes called “X-ray” tetras. Just above, a nice Nano Fish for sale in our online store. It is beautiful on the outside and timid by character. Momchil has had his fair share of aquarium care in the past 13 years. Paedocypris Progenetica has a thin and somewhat transparent body with rather weird pelvic fins that have clutching pads that males use to grab the females during mating. This implies that more water surface area is needed for their habitat, even though they don’t grow large in body size. Can least killifish be kept in pairs or do they need a bigger school? White Cloud Mountain Minnows are most definitely the best nano fish for a cold water temperature that can be kept in unheated aquariums. Pristella tetras are also very peaceful when being kept in a small school of, say, 6. In Aquanswers, Momchil shares knowledge about freshwater and saltwater home aquariums with the people from his community. I am yet to find out if this is a universal phenomenon. This makes them feel secure and confident enough to move around in the aquarium. Pygmy Corydoras are a good choice. They add great beauty and activities to the tank; their darker orange fins intensely change color and it is fun to watch, the least. 0 0. zeng. I think their max size is around 1″. I keep my Rosy Loaches at 77°F ( 25°C) temperature of the aquarium water. I love it mostly for its cool-looking colors which, you could think, are too stunning to be real. Although active, they are very timid when fewer or alone. Now, they are really charming and hyperactive, especially when in a large school. Paedocypris progenetica has been claimed to be the one of smallest known species of fish in the world. Adding floating plants is also an excellent option for the Pygmy Hatchetfish; Mosquito Fern or Red Root Floaters, for instance. Join Yahoo Answers and get 100 points today. Paedocypris Progenetica. The Dwarf Rasbora is the smallest schooling nano fish for home aquariums. Lv 7. I’m thinking of getting a 4 gallon tank. He would not wait for the scientists to do the naming! Could I keep 2 male least killifish in it with a mystery snail? Driftwood will also be beneficial to this aquarium setup, adding a chunk of floating freshwater plants in the aquarium, grow lights that are designed to support the growth of aquarium plants, predate and feed on small snails and snail babies, checking my top picks for tiny water heaters, best micro fish for a small 5-gallon tank, feel confined in smaller aquariums they become more aggressive, 15 Floating Aquarium Plants for Beginner Freshwater Aquarists, Best Fertilizers & Plant Foods for THRIVING Aquarium Plants, 1 inch (2.54 cm) but they’ll generally remain around 0.8 inches (2 cm), at least 10 gallons, but preferably 20 gallons, 1 inch (2.54 cm), but the majority remain at 0.98 inches (2.48 cm), a minimum of 10 gallons to house a school, 1 inch (2.54 cm), but most adult specimens will remain at around 0.75 inches (1.9 cm), 1.9 inches (4.8 cm) but most adults will remain at around 1.7 inches (4.3 cm), 10 gallons at the absolute minimum, but preferably 15 gallons, 30 gallons because of how active these micro fish are in the aquarium, 1.2 inches (3 cm) but in general these fish will remain at around 0.8 inches (2 cm), 2.8 inches (7.1 cm) but most will stay at 2.5 inches (6.4 cm), 5 gallons or more for a single male with 2 females, the largest adult ever measured was 0.65 inches (1.67 cm), 5.5 gallons but a 10 gallon fish tank is preferable as the minimum, 0.9 inches (2.3 cm) but a standard length of a fully-grown specimen is around 0.7 inches (1.8 cm), 10 gallons or more, because of how active Embers are, Lights: If you go ahead and add floating plants, then check, Filtration: For a small tank with 6 Pygmy Hatchetfish I recommend using, Heater: If you have a 10-gallon tank with a school of Pygmy Hatchetfish, then, PH Regulation: This nano fish species require low PH in its water, so if you are looking for an easy and natural way to achieve this, add some, Heater: With its slick design and accurate temperature maintenance, the Cobalt Aquatics Neo-Therm heater deserves your attention.