Embarking on the journey of setting up a community aquarium is thrilling. One of the pivotal decisions to make early on is selecting the right tank size. The size of your tank plays a crucial role in ensuring a harmonious and healthy environment for your fish and other creatures. This post will guide you through the considerations and tips for choosing the perfect tank size for your community aquarium setup.

Species Size and Count:

Understanding the space requirements of each species in your aquarium is crucial. For instance, if you’re planning a community tank, it’s vital to consider their adult size and social behaviors.

Example with Guppies, Tetras, and Corydoras:

  • Guppies: Grow up to 6.35 cm and are peaceful.
  • Tetras: Grow up to 5 cm and prefer swimming in groups.
  • Corydoras: Grow up to 7.6 cm and like to forage on the tank bottom.

Small Tank (75 liters):

  • Guppies: 5
  • Tetras: 10
  • Corydoras: 4

Medium Tank (150 liters):

  • Guppies: 10
  • Tetras: 20
  • Corydoras: 8

Large Tank (300 liters):

  • Guppies: 20
  • Tetras: 40
  • Corydoras: 16

Example with Platies, Harlequin Rasboras, and Cherry Shrimp:

  • Platies: Grow up to 7 cm, peaceful.
  • Harlequin Rasboras: Grow up to 5 cm, peaceful schooling fish.
  • Cherry Shrimp: Grow up to 4 cm, peaceful scavengers.

Small Tank (75 liters):

  • Platies: 5
  • Harlequin Rasboras: 8
  • Cherry Shrimp: 10

Medium Tank (150 liters):

  • Platies: 10
  • Harlequin Rasboras: 15
  • Cherry Shrimp: 20

Large Tank (300 liters):

  • Platies: 20
  • Harlequin Rasboras: 30
  • Cherry Shrimp: 40

These examples provide practical insights into planning your community tank based on different tank sizes and species. Each setup ensures there’s adequate space for each species while maintaining a vibrant community dynamic.


A well-maintained tank is crucial for the well-being of your aquatic community. Here are steps to maintain stability in your tank:

Regular Water Changes:

  • Small Tank: Weekly 15-20% water change.
  • Medium Tank: Bi-weekly 15-20% water change.
  • Large Tank: Monthly 15-20% water change or bi-weekly 10-15% water change.

Filter Maintenance:

  • Clean filter media monthly or as per the manufacturer’s instructions.

Monitoring Water Parameters:

  • Check pH, ammonia, nitrites, and nitrates weekly, especially after adding new inhabitants.

Algae Control:

  • Regularly clean algae from surfaces and consider adding algae-eating species.
  • Algae can be a useful food source for some species and, if kept under control, can be an indicator of a healthy ecosystem.

Cost-Saving Tips:

  • Seasonal Sales: Look for discounts during seasonal sales or promotions at your local pet store or online.
  • Used Equipment: Check local listings or online marketplaces for used tanks, stands, and other equipment.
  • Local Aquarist Online Groups: Join local online aquarist groups for advice, and sometimes free or discounted equipment and livestock.
  • Energy-Efficient Equipment: Opt for LED lights and energy-efficient heaters and filters to save on electricity bills.
  • Plant Cuttings: Obtain plant cuttings from fellow hobbyists or trim your own plants for propagating.

Space and Budget:

Adequate planning for space and budget is crucial for a successful community tank setup. Here’s how to approach it:


  • Measure the area where you plan to place the tank.
  • Ensure there’s room for equipment and maintenance access.
  • Consider the lighting, temperature, and traffic around the tank location.


  • Initial Costs:
    • Tank and Stand: Costs vary depending on size and material.
    • Filtration and Lighting: Essential for a healthy tank.
    • Substrate, Decorations, and Livestock: Plan according to your chosen theme and species.
  • Ongoing Costs:
    • Food, water testing kits, and maintenance supplies.
    • Unexpected expenses like medications or replacement equipment.

Cost-Saving Tips:

  • Buy in bulk where possible, like food and water conditioner.
  • Consider DIY solutions for decorations and stands.

Growth and Addition:

Future Additions:

  • Research the adult size and behavior of species you might want to add in the future.
  • Make sure the filtration and heating system can accommodate the added bioload.

Growth Space:

  • Adequate space reduces stress, promotes healthy growth, and minimizes aggression among tank inhabitants.
  • Regular monitoring helps to ensure that the environment remains conducive as your aquatic pets grow.


  • Space is crucial for breeding activities, providing areas for spawning and for fry to grow.
  • Consider separate breeding tanks or designated breeding areas within the tank to ensure the safety and comfort of breeding pairs and fry.

FAQ Section:

1. Can I upgrade my tank later on?

  • Yes, upgrading is an option but it’s more cost-effective to start with the right size.

2. How do I calculate the right tank size?

  • Research the space requirements of your chosen species and consider their adult sizes, social behaviors, and compatibility.

3. What if my budget is limited?

  • Look for cost-effective solutions like buying used equipment or choosing hardy, low-maintenance species.

4. How often should I clean my tank?

  • It depends on your tank size, filtration efficiency, and species. Regular water testing will guide your maintenance schedule.

5. Can I mix cold water and tropical species?

  • It’s not advisable as they require different water temperatures which can stress or harm the fish.

6. Do larger tanks require more maintenance?

  • Not necessarily. Larger tanks can be more stable and require less frequent but possibly more time-consuming maintenance.

7. What’s the significance of the tank’s shape?

  • The shape affects the swimming area and water surface area, which impacts oxygen exchange and fish comfort.

8. How do I know if my tank is overstocked?

  • Signs include poor water quality, frequent illness, and aggressive behavior. Regular water testing and monitoring fish behavior are key.

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