About This Tool
### Can I Add More Fish?
Adding "just one more fish" is tempting, but overstocking leads to poor water quality, algae blooms, and sick pets.
This **Aquarium Stocking Calculator** uses the general "Inch Per Gallon" rule to give you a quick safety check.
### How It Works
1. **Tank Size**: Enter your aquarium volume (e.g., 20 Gallons).
2. **Add Fish**: List your species and their adult size (e.g., Neon Tetra, 1.5 inches).
3. **Check Level**: We sum the total inches of fish and compare it to your volume.
Key Features
- **Multi-Species List**: Add as many different fish as you have.
- **Oversize Warning**: Alerts you if the tank is >85% stocked.
- **Inch-per-Gallon Logic**: Best for small community fish (Tetras, Rasboras, Guppies).
- **Dynamic Updates**: See the percentage change as you adjust quantities.
Frequently Asked Questions
Is the 1 inch per gallon rule accurate?
It is a decent *guideline* for small, slim-bodied tropical fish. It does NOT apply to heavy waste producers like Goldfish, Cichlids, or Turtles. For those, you need 2-3x more water volume.
What does 'Maxed Out' mean?
Once you hit 85-100% capacity, your filter has to work very hard to keep the water clean. You must be diligent with weekly water changes.