Some fish that are recommended for the smaller tank are mollies, platies, tetras, guppies, danios etc.
Female guppies grow to 2 inches and the males are a bit smaller at around 1.5 inches. Their depending on the genes, food, nutrition and more. They are known to be small fish and get pushed around in community tanks for that reason. Be careful of larger fish trying to eat guppies. Guppies are very small fish but pack a tremendous appearance.
The Asian stone catfish is one of the cutest and smallest catfish species in the hobby. Maxing out at just over inch, this adorable, whiskered catfish makes for a unique addition to a nano tank. However, do not expect much activity from this little guy as the the stone catfish is very inactive and will likely stay in one place most of the time.
Best Fish for a Small Tank | PetHelpful
Nano fish for small tanks | Aquariadise
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.However, many do start with just a small fish tank, so we want to give you a list of items to use with your small aquarium so that you can increase your chances for success in tropical fishkeeping. If you need help with setting up your new tank, check out the page.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.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.