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Goldfish actually require a well filtered tank with room for growth as they can reach large sizes. Goldfish are cold water Freshwater Fish. Corals and sea things are warm water salt water things. So regardless of tank size compatibility is impossible.

A fancy goldfish needs 20 gallons, and then every other fish you add needs another 10 gallons.

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Q: What size tank do you need for 2 goldfish. I want some coral and sea things but Not too big a tank?
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If your goldfish is about 2 and a half inches long how big does its tank need to be?

Regardless of the type or size of goldfish the minimum acceptable size of an aquarium for a goldfish is 30 gallons. Buy a tank that is at least 30 gallons if you plan to have goldfish. You can comfortably fit 3 goldfish in a tank this size but no goldfish in a tank any smaller. Goldfish are essentially pond fish and need lots of space to swim; they will not thrive in a small aquarium.


Can an oranda goldfish live in same tank with regular goldfish?

Yes, but your tank size needs to support it. If you mean that a regular goldfish is a long single-tail goldfish, then you need at least a 40 gallon tank just for the 2 fish due to the size potential of the common goldfish. If you mean a regular goldfish as in a round bodied fantail, or perhaps a ryukin, then you need at least a 30 gallon tank for the 2 fish.


What size fish tank do you need for 3 goldfish?

Goldfish need at minimum 20 gallons for one fish, plus 10 gallons for each additional goldfish being added to the tank; this means that fro 3 goldfish, you need at minimum a 40 gallon tank.It's not just about their potential size as adults, which is big, but because they are very messy fish and produce a very high amount of waste.


I have ten goldfish and two koi what size tank do I need?

50-100 gallons


What are some things that are important for the health of the coral reef?

Some things that are important for the health of a coral reef are the size of the reef what types of coral are next to each other, pH of the water, how much oxygen is present, movement in the water, toxins in the water, reproduction, temperature of the water, food supply, preditors and the age of the coral. Coral is an animal and not a plant.


Can 4 goldfish live in 5 gallons of water?

no they need at least five gallons each. a thirty gallon tank is a good size tank to keep goldfish in.


How much water do you need for a goldfish in a fish tank?

About 2/3 or 3/4. Basically depends on the size.


What is the size of a coral reef?

The Coral Reefs can go up to 100kg .


Can gender affect the size of a goldfish?

no


Why do goldfish do not have a stomach?

Actually, goldfish do have a stomach, but it's very small, probably about the size of one of their eyes.


How big is a brain of a goldfish?

The size of a goldfishes brain would depend upon the size of the goldfish. It is however quite large enough to enable the goldfish to survive. By comparison to mammals though it is small.


How many gal tank do you need for 1 goldfish?

One goldfish requires at minimum 20 gallons not only because of their size potential, but because they are very messy fish and produce a high amount of waste