The Best Freshwater Fish for Small Tanks - Aquarium Base

Lemonade/drink dispenser for small fish -drain 2/3 to clean tank & use old water for plants!
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The next option is the Sparkling Gourami, a small fish growing to 1.5 inches in length suitable for small densely planted tanks with lots of hiding places.
Oxygen isn't really the concern. It's waste. Too many fish in too small of a body of water create too much pollution for the tank to handle.
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Not to mention, Rams would look like big fish in a little tank. My Blue Neons look like they are the appropriate size for my set up. That actually makes it look better proportionally than big fish in a small tank does. Jan 7, 2017 - Learn how to choose the best fish for your small tank and better ..
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Photo provided by FlickrYou should never keep goldfish in a bowl, or in a tank that is too small for them
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Finding small saltwater fish tank species for a small marine aquarium (nano tanks) is not difficult and they are often easily found in local saltwater reef stores and online. If you have a small saltwater aquarium it is vital to keep it lightly stocked and your water parameters stable. Make sure you research any fish you decide to get before you go to the store. Do not make that impulse buy or you may regret it later.If you have a small aquarium, it can be pretty hard to find the right fish to stock it with. Most of the popular choices for smaller tanks – pygmy corydoras, dwarf puffers, clown killifish – should still be kept in at least around 10 gallons (40L) and are wrongly marketed towards smaller setups. So what choices does that leave us with? Not that much, but there are still a few choices. Any fish tank from 10 to 30 gallons could be considered a small saltwater fish tank for the purposes of this article. Really, any saltwater tank under 30 gallons is going to be a chore to maintain (my opinion of course, to each his own). Nano tanks are often considered even smaller. It should also be noted that the smaller the fish tank the harder it is to keep in my opinion. Larger tanks provide so many more options for both equipment and fish species and I strongly urge any new hobbyists to get the largest tanks they can accommodate. Leave the smaller specialty for when you become more experienced later on.Note: Please do not keep fish in any aquarium smaller than 5 gallons. These extreme nano tanks cannot hold a stable cycle and you should only keep invertebrates with a small bioload in them. Please also do not keep more than one species of fish in a nano tank to prevent overcrowding. list contains some suggestions for suitable invertebrates.Keep reading for a short list of the actual smallest of the smallest fish which can be kept in tanks under 10 gallons.Although Heterandria formosa are commonly known as “least killifish”, they’re not actually killis! These tiny livebearers are a fun species to keep in your nano tank due to how easy it is to breed them. A ‘harem’ with 1 male and 2 females can be kept in tanks as small as 5 gallons (20L), while bigger groups are possible in slightly bigger setups.