## Best answer

1 inch

## People also ask

### How many fish per gallon of water do I Need?

What is the One Inch of Fish Per Gallon Rule? In general, most hobbyists?rule of thumb is 1 inch of fish per gallon of water. For example, if you have 2 inches size of fish, you need 2 gallons of water. However, this is a guideline as there may be exceptions to this rule, so it is important to understand what may affect these exceptions.

### How many fish should I stock in my Aquarium?

Truthfully, there is no perfect way to calculate the actual quantity of fish to stock in your aquarium. But, there is a general rule to stocking fish, and that is ?1 inch of fish for each 1 gallon of aquarium water ? Seems so simple and easy, right?

### How many fish in a 10 gallon tank?

In a general estimate, in a regular fish for 5 gallon tank of water, you can easily support 3-5 fishes if no one is fighters. The 10 gallon fish tank doubles it.

### How many goldfish in a 25 gallon aquarium?

This rule worth nothing and should be ignored for one simple reason: every fish species have a different body mass and produce a different amount of waste. According to this rule, my 25-gallon aquarium could hold a maximum of 25 neon tetras (one inch each) or 12 goldfish (two inches each).