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What is the smallest freshwater aquarium fish?

I know some people ask about the smallest fish, but is that an aquarium fish and what are it's common names if it is. I am setting up a five gallon glass aquarium with a 5-15 gallon filter, freshwater sand and a mix of live/silk plants and a flourescent lightbulb and a heater for up to 10 gallons and an LED electronic thermometer. (a side question, how to you 'calibrate' a thermometer?) What can I put in it? Not a betta, because I already have three, one of which lives in it's own 5 gallon and the other two live in two of my mom's community tanks (one in each, they have free range, none of that betta box nonsense for me) I am wanting something different now, and I will NOT put goldfish in it, so don't even suggest it, I will give you a thumbs down because it is cruel to keep a goldfish in anything less than 10 gallons, more is better, I havee two commons in a 29 gallon and if my mom gets tired of her 55 gallon, they'll move into it. TRhey were pond fish, but someone (cont.) poured pesticide into my uncle's pond and killed them (they were 'killing the mosquito larvae and tadpoles') We called the police, but they denied it and we couldn't prove it was them but they told US they did it. So anyway, Nemo and Marlin somehow survived (about 12 other goldies and 3 koi bit it, though)and were about an inch long when I got them and now they are healthy happy lads of about 3 inches or so. I love them a lot, even though nemo is a bit of a bully, but he kind of acts like he wants to breed with Marlin(swimming along side him and some chasing, but no fin biting), but they are still young and don't have any tubercles (or whatever they are called) So I don't know if they are Nemo and Marlin or Nemette and Marleen, or a combo.

Public Comments

1. guppy or beta (I have a beta)
2. I think those bumblebee gobies are freshwater - well more like brackish but not saltwater. They are tiny and very cute, but need lots of space and can be agressive so not good at all for a small tnak. Five gallon is ONLY good for one single betta. Don't torture an innocent fish because you want another five gallon tank, that is just mean. Even small fish like guppies need more space because they like to swim -- how would you like to live in a prison cell?
3. A tetra would be good. A black phantom tetra is not expensive but grows up to 1.5-2.0 inch. It's very pretty ones it grows up. and the set-up you are going to use is just what you need. tetras like to have plants and they don't really like bright lights so he'll have the plants to hide in them. they love fish flakes so it's best to feed them that. feed them food with color enchantments, after a few months of caring for them they will show their best colors. click on the site below and you'll find lots of info on every kind of tetra fish. don't get only 1 get 2 at least they like to swim in groups so i would say 3 at least.
4. neon tetras would be good get 4 and a corycat and you will have a nice tank