Clado In Shrimp – The Definitive Guide To Identifying And Treating Gre
If you have spent any time staring at your beautiful Neocaridina colony, nothing stops your heart faster than seeing a strange, neon-green fuzz growing under a shrimp’s belly.
You probably feel a mix of panic and confusion, wondering if your entire tank is at risk or if you have done something wrong.
Don’t worry—dealing with clado in shrimp is a common hurdle for many hobbyists, and I am here to walk you through the exact steps to clear it up.
In this guide, we will cover how to identify this parasitic algae, the most effective treatments, and how to ensure your shrimp stay healthy and vibrant for years to come.
What Exactly Is clado in shrimp?
To treat a problem effectively, we first have to understand what we are actually fighting against in our aquariums.
While most hobbyists refer to this condition as “Green Fungus,” it is actually caused by a parasitic chlorophyll-less algae known as Cladogonium ogishimae.
Unlike regular algae that grows on your glass or rocks, clado in shrimp has evolved to live specifically on the exoskeleton of freshwater crustaceans.
It is a specialized parasite that anchors itself into the shrimp’s tissue, primarily around the pleopods (the swimming legs under the tail).
Because it is an algae and not a true fungus, traditional anti-fungal medications often fail to work, which leads to a lot of frustration for beginners.
The good news is that because we know it is an algae, we can use specific treatments that target plant-like organisms without harming the shrimp.
How to Identify the Infection Early
Early detection is the single most important factor in saving an infected shrimp and preventing a full-tank outbreak.
You should perform a “visual census” of your colony at least once a week during feeding time when the shrimp are gathered together.
Look closely at the underside of the tail; the infection looks like a bright green, feathery, or “fluffy” growth attached to the swimmerets.
It is often mistaken for eggs, but shrimp eggs are round, distinct spheres, whereas clado in shrimp looks like a miniature green forest.
In the early stages, it might just look like a slight greenish tint or a few tiny filaments, so a magnifying glass can be a hobbyist’s best friend here.
As the infection progresses, the growth becomes denser, making it difficult for the shrimp to swim or fan its eggs properly.
If left untreated, the parasite eventually draws enough nutrients from the host to weaken its immune system, leading to secondary bacterial infections.
Distinguishing Clado from Ellobiopsidae
There is another parasite called Ellobiopsidae that looks remarkably similar to the untrained eye, but it is much more dangerous.
While Cladogonium (Clado) stays mostly on the surface of the shell, Ellobiopsidae actually invades the internal organs and muscle tissue of the shrimp.
Ellobiopsidae usually appears as more of a yellowish-green, granulated growth rather than the feathery filaments of Clado.
Knowing the difference is vital because while Clado is very treatable, Ellobiopsidae is often terminal and requires immediate culling to save the colony.
If the growth looks like “broccoli” rather than “feathers,” you are likely dealing with the more severe internal parasite.
The Root Causes of an Outbreak
You might be wondering, “How did this get into my tank in the first place if I haven’t added anything new recently?”
Most often, the spores of clado in shrimp are introduced through new livestock that wasn’t properly quarantined before being added to the main display.
However, a healthy shrimp with a strong immune system can often fight off low levels of these spores without an infection taking hold.
Outbreaks usually occur when the shrimp’s immune system is compromised by stress, which can be caused by fluctuating water parameters.
High nitrates, inconsistent temperatures, or a lack of essential minerals (GH/KH) can all weaken your shrimp’s protective slime coat.
Poor tank hygiene, such as decaying organic matter in the substrate, provides a breeding ground for various pathogens and parasites.
By maintaining a stable environment, you make it much harder for parasites to gain a foothold in your colony.
Understanding the Lifecycle of clado in shrimp
To beat this parasite for good, we have to understand how it reproduces and spreads through your aquarium water.
The algae grows by extending “roots” into the soft tissue between the segments of the shrimp’s exoskeleton.
As it matures, it produces spores that are released into the water column, searching for a new host to attach to.
This is why you might see one infected shrimp today and three more a week later if you don’t take action immediately.
Interestingly, the parasite is usually shed along with the molt, but if the shrimp is weak, it can re-infect the new, soft shell almost instantly.
This is why removing molts from an infected tank is a crucial part of the treatment process that many people overlook.
By breaking the lifecycle at the spore stage, you ensure that once your current shrimp are cured, the problem doesn’t return.
Step-by-Step Treatment: The Salt Dip Method
The most effective and “tried and true” method for treating clado in shrimp is the aquarium salt dip.
Salt works by dehydrating the algae filaments through osmotic pressure, causing them to die off while the shrimp remains relatively unharmed.
To perform a salt dip, dissolve 1 level tablespoon of pure aquarium salt (not table salt) into 1 cup of dechlorinated tank water.
Gently catch the infected shrimp and place it in the salt solution for about 30 to 60 seconds.
Watch the shrimp closely; if it shows signs of extreme distress or stops moving, remove it immediately and put it back in fresh water.
You should see the green fuzz start to turn a pale or white color over the next 24 hours, which indicates the algae is dying.
Repeat this process once a day for 3-5 days until the growth is completely gone from the swimmerets.
Using Hydrogen Peroxide (H2O2) for Spot Treatment
If the salt dip isn’t doing the trick, or if the infection is particularly stubborn, common 3% Hydrogen Peroxide is a powerful ally.
Hydrogen Peroxide is an oxidizer that kills algae on contact but breaks down into harmless water and oxygen very quickly.
The safest way to use it is to remove the shrimp from the tank and place it in a small container with just enough water to cover it.
Use a syringe to drop 0.5ml of 3% $H_2O_2$ directly onto the infected area while the shrimp is submerged.
Let the shrimp sit in that solution for about 2 minutes before returning it to its quarantine or main tank.
Alternatively, you can dose the entire tank at a rate of 1ml per gallon, but this is less effective for direct parasite removal.
Always be cautious with $H_2O_2$, as overdosing can damage the beneficial bacteria in your sponge filters.
The Role of Seachem Excel and Glutaraldehyde
Since Clado is an algae, liquid carbon products like Seachem Excel can be used as a supplementary treatment.
The active ingredient, Glutaraldehyde, is a potent algaecide that is commonly used in planted tanks to kill BBA (Black Brush Algae).
In a shrimp tank, you can dose Excel at the recommended daily rate to help kill any free-floating spores in the water column.
Some hobbyists have success with “spot dosing” Excel directly onto the shrimp’s belly using a pipette during a water change.
However, be very careful, as shrimp are sensitive to high concentrations of liquid carbon, and it can deplete oxygen levels.
Always ensure you have high surface agitation from an air stone or filter outlet when using liquid carbon treatments.
I recommend using Excel as a preventative measure for the rest of the colony while treating the infected individuals with salt dips.
Setting Up a Proper Quarantine Tank
When you discover clado in shrimp, the first thing you should do is move the affected individuals to a separate “hospital” tank.
This prevents the parasite from releasing more spores into your main colony and allows you to use more aggressive treatments.
A hospital tank doesn’t need to be fancy; a simple 2.5-gallon glass tank or even a clean food-grade plastic tub will work.
Use a small sponge filter that has been “seeded” with bacteria from your main tank to keep the water cycle stable.
Do not use substrate in the hospital tank, as a bare bottom makes it much easier to spot and remove shed molts.
Keep the temperature stable and perform small, daily water changes to keep the water pristine during the recovery period.
Once the shrimp has gone through two clean molts with no sign of green fuzz, it is safe to move them back to the main display.
Preventing Future Outbreaks in Your Colony
The best way to deal with clado in shrimp is to make sure it never enters your aquarium system in the first place.
Always quarantine new shrimp for at least 3-4 weeks before adding them to your established tanks.
During this time, observe them daily for any signs of green growth or unusual behavior.
Maintain a strict water change schedule, aiming for 10-15% weekly to keep nitrates low and minerals replenished.
Feeding a high-quality, varied diet including specialized shrimp pellets, blanched vegetables, and mineral supplements will boost their immune systems.
Avoid overfeeding, as rotting food creates an environment where parasites and harmful bacteria thrive.
Lastly, keep your aquarium tools (nets, gravel vacs) separate for each tank, or disinfect them with a bleach solution between uses.
Common Mistakes to Avoid During Treatment
One of the biggest mistakes beginners make is trying too many treatments at once, which stresses the shrimp to death.
Choose one method—either salt dips or $H_2O_2$—and stick with it for at least a few days before trying something else.
Another mistake is failing to remove the molted shells from the tank immediately.
If an infected shrimp molts, the “green fuzz” stays on the old shell and can release thousands of spores back into the water.
Don’t skip the quarantine period just because the shrimp “looks healthy” when it arrives from the store.
Lastly, never use copper-based medications in a shrimp tank, as copper is highly toxic to all invertebrates and will kill your entire colony.
Patience is key; it may take a few weeks for the shrimp to fully recover and regain its strength.
Frequently Asked Questions (FAQ)
Is clado in shrimp contagious to fish or humans?
No, Cladogonium ogishimae is a specialized parasite that only affects crustaceans like shrimp and occasionally crayfish. It poses no risk to your fish, snails, or yourself.
Can a shrimp survive a Clado infection?
Yes! If caught early and treated with salt dips or $H_2O_2$, the survival rate is very high. The key is to act before the shrimp becomes too weak to molt or eat.
Will the green fuzz go away on its own?
Unfortunately, no. Because it is a parasite feeding on the shrimp, it will continue to grow and spread until the host dies or the parasite is killed through treatment.
Does “Green Fungus” affect all shrimp species?
While it is most commonly seen in Neocaridina (Cherry Shrimp), it can also affect Caridina species and Ghost Shrimp. Neocaridinas seem more susceptible due to the high-density farming conditions they are often raised in.
Can I use Melafix or Pimafix to treat Clado?
No. These are herbal-based treatments designed for bacterial and fungal infections in fish. They are not effective against the parasitic algae that causes Clado.
Conclusion: Keeping Your Shrimp Healthy and Happy
Dealing with clado in shrimp can be an intimidating experience, but it is also a great learning opportunity for any aquarist.
By identifying the symptoms early, isolating the infected individuals, and using proven methods like salt dips, you can successfully save your colony.
Remember that the health of your shrimp starts with the quality of their environment.
Consistent water parameters, a clean tank, and a stress-free habitat are your best defenses against any parasite or disease.
Keep a close eye on your little aquatic friends, and don’t be afraid to take action the moment you see something out of the ordinary.
With the right knowledge and a bit of patience, your shrimp will be back to their active, colorful selves in no time!
