How Many Fish Can Be In A 15-gallon tank?
Ah, yup this question again!
And if I’m being honest it depends!
Seriously though, how many fish can you put in a 15-gallon tank?
Well, you should try to aim for one small fish per gallon of water and by “small” fish I mean like Tetra sized fish.
Basically, it equates to approximately 1 inch of fish per gallon.
But it’s not always that easy, you can see my thoughts on that here to see what I really think.
That said, you should be able to fit about 10-15 small fish in your tank at first and as the tank matures and you get better at fish keeping. You can maybe keep 15-25 if you don’t mind some work.
However, this is what most beginners do, they buy a 15-gallon tank and fill it with a few fish without doing a little bit of research.
But you’re not like most people and you at least asked the question, so good on you.
The problem most beginners don’t realize is that you need to consider a few things like;
- The growth rate for your fish
- Their temperament, how aggressive are they?
- How dirty are they
For example, a small goldfish can grow up to 6″ in size in less than a year.
Can you see a huge 6″ Goldfish living comfortably in a 15-gallon tank?
Maybe, but it’s getting cramped
That said, what if you could find a few examples of fish you could put in your 15-gallon tank?
Well, you’re in luck, that’s what I’ve prepared below.
Further Reading: Best freshwater aquarium fish
What Are The Best Fish For A 15-Gallon Tank (Freshwater)
Below are a few of the Best Fish Species for a 15 Gallon Fish Tank?
- Small tetra species
- Small Rasboras
- Dwarf Gourami species
- Bettas (Siamese fighting fish)
- Fancy Guppies
To help we’ve split them into a few groups:
- Corydora Catfish
- Dwarf Cichlids
- Small Tetras
- Corydora Catfish
Hopefully, that was helpful, but if that list wasn’t BIG enough for?
No worries, just wait until you see the next list!
15-gallon Fish Tank Stocking Ideas?
Alright, here it is, the biggest stocking list for a 15-gallon tank that I could create.
There are literally 40 fish you can pick from.
Photo Credit: Cliff
Photo Credit: Drew Tyre
- Lambchop Rasbora
- Chilli Rasbora
- Glowlight Rasbora
- Harlequin Rasbora
- Least Rasbora
- Dwarf Rasbora
- Red Dwarf Rasbora
- Microrasboras Galaxy
Photo Credit: Allie_Caulfield
- Parrot Platy
- Red Platy
- Coral Platy
- Red Diamond Platy
Photo Credit: Jorge Correa
- Endler Guppies
- Fancy Guppies
Photo Credit: LEONARDO DASILVA
Dwarf Gourami Centerpiece Fish” width=”650″ height=”434″ />
Photo Credit: Bernat Arlandis
Photo Credit: h080
- Panda Corydoras Catfish
- Albino Corydoras Catfish
- Skunk Corydoras Catfish
Photo Credit: Emilia Murray
Photo Credit: JellyFishKiller
If none of the above species are what you’re looking for in terms of fish, well too bad that was a lot of work and maybe you need a larger tank.
Or you can check out one of these articles for more ideas:
That said, a larger tank is not only easier to maintain but will provide you with the opportunity to keep a wider selection of fish.
Alright now for the main event!
What Are Some Good Fish Combinations For A 15-Gallon Tank?
In general, when stocking your 15-gallon tank try to have one or two larger “Centerpiece” fish and fill in the rest with a school of smaller fish and a few bottom dwellers like shrimp or catfish.
It’s really up to you!
Here are a few suggestions you can try:
Combo-One: The Betta Tank
- 1 Betta Fish
- 8-10 Harlequin rasbora
- 4 Panda Corydoras Catfish
Combo-Two: The Ram Tank
- 1 pair (m/f) Electric Blue Rams
- 8-10 Ember Tetra
- 4-6 Albino Corydoras Catfish
Combo-Three: The Gourami Tank
Lastly, if you’re a beginner you could try setting up a low-tech planted tank with a few live plants.
This will help keep the water quality in check and prevent spiking.
Some great beginner plants are;
In a 15-gallon tank try;
- 2-3 x Java Fern
- 6 x Anubias
- 2-3 x Java Moss Ball
Overall a fifteen-gallon tank is a great size for a beginner to start a small community tank!
And always remember It’s important to understand the nitrogen cycle and how to maintain healthy water conditions for your fish.
How Many Goldfish In A 15-Gallon tank?
You’ll notice that out of all the fish I listed above the Goldfish was not one of them. That’s because they need more space than a 15-gallon tank.
Seriously, they poop a lot and grow way too big, don’t do it! Seriously don’t.
How Many Neon Tetras In A 15-Gallon Tank?
Neon Tetras are great little fish that will provide little shimmers of colorful excitement in your tank.
If you only kept Neons in the tank you could fit about 10-20 Neon tetras comfortably in a 15-gallon tank or you could use some of these tank mates with Neon Tetras.
How Many Cichlids In A 15-Gallon Tank?
For a tank this size I would recommend you only keep some of the more docile Cichlids like Dwarf Cichlids, Rams or Apistogramma (see the list above).
It would also be best to only keep 1 pair (m/f) of the same species and then fill in the tank with some smaller tank mates.
Further Reading: Cichlid Tank Mates
How Many Guppies In A 15-Gallon Tank?
Guppies are great little fish especially the Fancy and Endler varieties which are available in so many different colors and combos.
You could fit about 6-12 guppies in a 15-gallon tank. But like I said earlier keep with one sex to avoid any unwanted babies.
How Many Platies In A 15-Gallon Tank?
With Platies you’ll want to keep about 4-6 with a mix of male and female, just be sure to have more females than males to avoid aggressive behaviors.