Can Jellyfish Be Kept With Seahorses? Full Compatibility Guide.

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There seem to be a lot of mixed emotions and different opinions when it comes to suitable tankmates for seahorses. One of the potential tankmates we’ll be discussing is jellyfish and whether they are compatible as tankmates for sensitive fish like seahorses.

Jellyfish cannot be kept with seahorses since they aren’t considered reef-safe. Not many tankmates are compatible with jellyfish due to their harsh stinging ability and toxic venomous nature. They require a species-specific tank that caters to their individual needs. Seahorses are too fragile and sensitive to share the same aquarium as them.

Especially with dangerous marine life like Jellyfish, you can’t take a chance with incompatible tankmates since the weakest occupant is the one that always suffers.

If you do want to keep seahorses and jellyfish it’s best to keep them separate in individual tanks that mimic their natural environments for optimal results.

This is by far the safest and probably the only option to keeping them if you’re certain in keeping both these types of marine life.

Why They Can’t Be Kept Together.

Seahorses and jellyfish share a very similar nature. They are very calm, passive, and overall not aggressive but the one thing that separates them is their painful sometimes deadly sting.

There are many reasons why a seahorse and jellyfish cannot be in the same tank some of which include;

1. Jellyfish and seahorses are incompatible. Jellyfish have tentacles containing thousands of nematocysts. Nematocysts contain a poisonous substance (venom) that helps jellyfish protect themselves. This means that even if a seahorse touches a jellyfish they will reap the harsh consequences which can sometimes consume them entirely.

2. Jellyfish often move with the current of the ocean, when kept in captivity they require a similar flow that’s circular. This is different from what seahorses require and it may be too turbulent for them to handle.

3. Jellyfish require a circular tank free from corners which can be potential hazards for them instead they require a circular tank. While seahorses need a tank that has enough space for hitching posts with enough vertical height.

4. Seahorses require the right tanks with a greater water capacity to cater to their heavy bioload. Small jellyfish tanks aren’t ideal, rather they need larger tanks with the right dimensions like these.

5. Seahorses require specific water parameters that may not be ideal for tropical jellyfish to thrive in. They normally require a water temperature of around 70-74F which is colder than usual tanks which may not be ideal for them depending on the species.

Risks Of Keeping Them Together.

Some beginners often lack experience and understanding of the hobby and may tend to do whatever they feel is right.

These beginner mistakes are normal but they come at a cost which most of the time only results in the death of the weakest tankmates.

Likewise, with keeping incompatible tankmates, there are a lot of risks associated some of which include

  • Injury of the weakest tankmate that is the seahorse. These injuries are often deadly for seahorses since the slightest scratch or bruise is enough to damage their sensitive bodies.
  • Venom can kill seahorses reducing their lifespan in the process.
  • Injuries also leave seahorses susceptible to infections which lead to their decline and possible death.
  • Jellyfish can also cause seahorses to stress which only compromises their immune systems that can open the door to a host of health issues which can totally consume them.

Compatible Tankmates For Seahorses.

In short, fish that are suitable as companions for seahorses must fit certain criteria to ensure their compatibility.

These calm timid fish require tankmates that are docile, nonaggressive specimens, which are fairly deliberate feeders that won’t out-compete them for food.

Compatible TankmatesCompatible with Caution
1. Goby ( Firefish, Purple, Neon)1. Tangs
2.  Cardinalfish ( Flame, Pajama)2. Clownfish (Percula, Ocellaris)
3. Dartfish (Red, purple, Exquisite, Helfrichi)
4. Jawfish (Yellow head, Blue dot)
5. Dragonet (Mandarin- red and spotted, scooter)
6. Pipefish (Banded, blue stripe, Janss)

Compatible Tankmates For Jellyfish.

There are many different kinds of jellyfish with different stinging abilities which makes it difficult to pair them with other tankmates.

However many have had success keeping certain species of jellyfish (moon jellyfish) with other tankmates.

Note: You must proceed with caution since these jellyfish cant sting other tankmates, that’s why its recommended for species-specific tanks

Compatible With Caution
1. Ocellaris Clownfish
2. Goby
3. Emerald crab
4. Snails
5. Hermit crab
6. Sandsifter star

Safest Option.

The safest option if you do intend on keeping both seahorses and jellyfish is to keep them in separate tanks.

This will ensure you keep your favorite marine wildlife while making sure they are well protected and cared for.

By keeping them individually you can cater to their own requirements providing the best possible environment for them to thrive.

Seahorses and jellyfish require very different environments and water parameters which may be compromised if kept together.

Requirements Of Seahorses.

Seahorses have very specific requirements for them to survive in captivity. They are more difficult to care for and are generally high maintenance.

1. They need mature water, free from ammonia and nitrite with low nitrate and phosphate levels.

2. As small as they are when kept in captivity they need ample water capacity to help dilute their heavy bioload.

3. They also need regular maintenance which includes water changes, water top-ups, and gravel siphoning.

4. They need an extra powered filtration system with the use of a protein skimmer to make sure water quality remains good.

5. They require moderate flow since they aren’t the best swimmers.

6. They must be away from direct sunlight and should have a cooler/heater to ensure specific water temperatures.

7. They require target feeding, to help reduce waste and detritus build-up which could be debilitating.

8. A good clean-up crew is also needed to cater to their messy tendencies and waste expulsions.

9. Many hitching posts are required for them to thrive since these areas are rest spots whereby they anchor themselves using their prehensile tail.

10. They need a species-specific tank due to their passive feeding habits and their sensitive nature.

When kept with tankmates they must be compatible with similar natures.

All these requirements help provide the optimal conditions needed for seahorses to thrive when kept in captivity.

Requirements Of Jellyfishes

Jellyfish are also another cool marine invertebrate that makes for interesting aquarium tank mates.

These subtle-natured stinging inverts must be kept under ideal parameters to ensure survival.

1. They require tanks that have no edges, generally circular tanks. This prevents them from getting stuck in the corners. Cylinder-shaped tanks are generally recommended.

2. Jellyfish are also planktonic and therefore require flow that will help keep them suspended in the water, if not they will sink to the bottom.

They need a rotating water flow that’s gentle yet sufficient enough to keep them moving.

3. Jellyfish also need colder water than other fish, the ideal temperature to keep a jellyfish in a tank is 53 to 64 degrees Fahrenheit.

4. Water quality is of utmost importance when keeping jellies, there should be no room for error.

5. Jellyfish also need the right light for them to thrive in captivity. Ideally, their tank should be away from direct sunlight but should have enough illumination.

6. Maintenance is also a priority as it ensures that water quality remains stable for these guys to thrive.

7. They normally do well when kept alone with others of their own kind. Even though these guys sting, they are actually very fragile and their membranes can easily tear if paired with the wrong tankmates.

Final Thoughts.

Both jellyfish and seahorses are very unique aquarium tankmates that are mesmerizing and interesting to look at.

However, they make the worst tankmates and should not be kept in the same tank.

Ideally, it’s best to keep these two marine life separate in their own tanks to ensure survival.

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