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I want to keep some discus fish with my silver arowana. Arowana is about 15 inches long. I would like to keep 3 - 4 inch size discus fishes with him. Is it possible? Any suggestions would help.  Thanks in advance.
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There is no guarantee that arowana and discus fish will get along well, but it's possible if you keep them in separate tanks. If the arowana is kept in a tank with other large fish, it may be harassed or even eaten. If the discus fish are kept in a small tank with the arowana, it may be able to get along.

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It is not recommended to keep Discus fish with Arowana due to differences in their requirements, temperament, and size. It can lead to stress, injury, and death.
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Keeping Discus fish and Arowana together in the same aquarium is generally not recommended. While it may be possible under certain conditions, there are several challenges to consider:

Tank Size: Both Discus fish and Arowana require large aquariums due to their adult size. Arowanas can grow quite large, requiring a tank with ample swimming space. Discus fish, although smaller, are more comfortable in groups and need a tank of sufficient size to accommodate them.

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People have put these two fish together, but it isn't a good idea at all. Adding the silver Arowana in the same tank as the discus fish will put stress on the fish. The discus fish likes to swim close to the top of the tank and will grow rather large. Furthermore, the Arowana will grow rather large and they move around way too much. This could hurt the discus fish if the Arowana ran into the fish a lot. I wouldn't recommend it at all.
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If both Arowana and discus are of small size like 4 or 5 inches then it's okay to keep them together. Both discus and Arowana are fishes that prefer pristine water quality. Water parameters required are also almost the same for both. Slightly alkaline and slightly warm temperatures are the ideal water conditions for discus. An aro will easily adapt to it. But the problem is if an aro becomes the big size of 20 inches or so then they may find their food in the school of discus fishes. Moreover, discus is slow-mover with a gentle living style which becomes more stressed with fast-moving big Arowana. Better not to keep them together. Some may find it hilarious. But my vision as a discus keeper is that one should keep discus in a planted tank. They will like plants a lot. Arowanas are a big no-no for a planted tank. So I can't keep them together.


A snap from my planted discus aquarium

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You certainly can. Just keep in mind that the arowana will grow far faster than the discus. However, the tank needs to be spacious or huge for both of them.
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Yes, it is possible to keep discus fish with an arowana. However, it is important to consider the size of the arowana, as a larger arowana may eat smaller discus fish. You should also make sure the tank is large enough to provide enough space for both species. Lastly, you should make sure the tank is well-maintained, as both species are sensitive to water conditions.
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It's not recommended to keep discus fish with arowana as they have different environmental requirements and the arowana may see the discus as prey.
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It would be possible to do this with arowana, but it would require some extra effort on your part. You might be able to find these size fishes at a local fish market or grocery store. They should be visible on the market for about $100-200.
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