How big does your tank have to be for a black moor fish?

A black moor goldfish needs a minimum tank size of 20 gallons for a single fish. However, this is just the bare minimum and a larger tank is always recommended.

Here's why:

* Goldfish grow large: Black moors can reach up to 12 inches in length, and they produce a lot of waste. A larger tank provides more space for them to swim and helps to dilute their waste.

* They are messy: Goldfish are notorious for being messy, and their waste can quickly pollute a small tank.

* They are active: Black moors are active swimmers and require space to explore and exercise.

For multiple black moors, the tank size should be even larger:

* 2 black moors: 30 gallons

* 3 black moors: 40 gallons

* 4 or more black moors: 50 gallons or larger

Remember: The larger the tank, the better for your black moor's health and well-being.

Always consider the long-term needs of your fish and choose a tank size that will accommodate their growth and activity level.