eSHa GDEX 20 ml bottle and box, antiparasitic against skin and gill worms

eSHa GDEX bottle and pictograms of skin flukes, gill flukes, Gyrodactylus and Dactylogyrus

eSHa GDEX treatment against skin and gill worms

Name: eSHa GDEX treatment against skin and gill worms
Brand: eSHa
SKU: ESHA79014
Price: 13.9 EUR
Availability: InStock

13,90 €

This antiparasitic treats skin and gill worms in freshwater fish, Gyrodactylus and Dactylogyrus, as well as tapeworms of the digestive tract. The plan runs over 5 days and 3 doses, and a 20 ml bottle treats 300 litres.

The course is well tolerated by shrimps, plants and the biological filter, and the product does not colour the water.

Ref. ESHA79014·Fish care

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The summary

What you receive: a 20 ml dropper bottle with its instructions for use.
What it targets: skin flukes, gill flukes and tapeworms in freshwater fish.
The treatment plan: 5 days, including 3 of dosing and a water change on the fifth.
For how many litres: 300 litres per bottle, for a full course.
The inhabitants spared: shrimp, plants and the biological filter.
Shipping: small bottle sent by tracked parcel, costs calculated in the basket.

Against skin flukes, gill flukes and tapeworms, 5 days for 300 litres

The eSHa GDEX treatment against skin and gill worms eliminates Gyrodactylus, Dactylogyrus and tapeworms in freshwater fish. A 20 ml dropper bottle treats 300 litres in a 5-day course, with 3 doses and a 20 to 50% water change on the fifth day. Shrimp, plants and the biological filter are spared.

This dropper bottle targets the flatworms that attach themselves to your freshwater fish: Gyrodactylus, which cling to the skin, and Dactylogyrus, which lodge in the gills. It also acts on tapeworms in the digestive tract. One 20 ml bottle covers a full course of treatment for 300 litres.

🔬 What the worms cause

Rubbing

The fish rubs itself briefly against the stones and the sand, several times an hour.

Respiration

Breathing speeds up, the gills swell and the fish stays beneath the filter outlet.

Depletion

Excess mucus covers the skin, then the fish slowly loses weight and becomes lethargic.

🫧 5 days, 3 doses

The plan runs over 5 days and requires only 3 dosings. On the first day, add 1 drop per litre of water. On the second and third days, add half a drop per litre. On the fourth and fifth days, there is nothing more to add, and on the fifth you change 20 to 50% of the water. Allow 100 drops for 3.2 ml if you prefer to measure your volume with a syringe. For a massive infestation or a persistent tapeworm, the same sequence is repeated on the eighth, ninth and tenth days, with a water change on the twelfth.

🩺 What stays in place

The course of treatment is well tolerated by your fish, your plants, the filter and shrimp. It does not colour the water and does not cause bacterial blooms in the water. Even so, remove the activated carbon, resins, UV and protein skimmer, which absorb the product, and keep the pump running. During these 5 days, feed less: nothing on the first day, half a ration on the second, then a gradual return over the following three. After the course, the eSHa Optima tonic supports recovery. This treatment is given at full dose together with the broad-spectrum treatment and with the discus treatment, which covers the secondary infections that are common in an already weakened fish.

Isolate the incoming fish

These worms almost always reach you with a fish that has not been kept apart, and they thrive in overstocked or poorly filtered tanks. A 15-day quarantine in a separate tank prevents most of these infestations. The treatment is intended for ornamental fish and excludes animals destined for consumption: in an aquaponic system, the affected fish is treated in a separate tank, which keeps the biofilter and the crops out of the loop.

Technical specifications

The essentials

Dose per litre: 1, then 0.5 and 0.5 drop
Volume treated: 300 L per 20 ml bottleAllow 100 drops for 3.2 ml if you are dosing with a syringe.

The 5-day plan

Dosing days: The first threeNothing to add on the fourth and fifth days.
Water change: 20 to 50% on the fifth day

Compatibility

Shrimp, plants, filter: Well toleratedThe product does not colour the water and does not trigger a bacterial bloom.
Given with: Broad-spectrum and discus treatmentsAt full dose, without reducing either of the two courses.

To budget for separately

Activated carbon: Fresh carbon, after the course
Quarantine tank: For incoming fish15 days in quarantine prevents most of these infestations.

In the box

1 dropper bottle of 20 ml
1 instruction leaflet

Doses, treatment duration, volume treated and compatibilities taken on 19/09/2026 from the eSHa Labs instruction leaflet, then on 11/10/2026 from the eSHa gdex product page.

Manufacturer and product safety

Manufacturer: Sea Horse IPC B.V. (eSHa Labs)
Postal address: Hertog van Brabantlaan 4, 6223 CJ Maastricht, Pays-Bas (boîte postale : Postbus 431, 6200 AK Maastricht)
Contact: contact@eshalabs.com
Website: eshalabs.com

Information provided under Regulation (EU) 2023/988 on general product safety.

Skin worms or intestinal worms: two opposing protocols

One is dosed for 3 days in a row, the other is given just once and repeated 2 weeks later. What you see on the fish decides it.

A skin worm and an intestinal worm The first shows in the fish's behaviour, the second shows at the back of the fish. The two protocols have nothing in common.

	Where it attaches	What you see	Also effective against tapeworms	Dosing days (days)	Litres treated per 20 ml bottle, full course (L)	50% water change after 24 hours	Second treatment 14 days later	Can be given alongside other treatments in the range	Price
Recommended eSHa GDEX treatment against skin and gillYour choice	On the skin and in the gills	Rubbing, swollen gills, rapid breathing	Yes	3 days	300 L	No	No	Yes	13,90 €
eSHa NDX dewormer against fish nematodesYour choice	In the gut	A red thread hanging from the vent	No	1 days	225 L	Yes	Yes	No	13,90 €

eSHa GDEX treatment against skin and gillRecommended

The worm you are looking for

Where it attachesOn the skin and in the gills

What you seeRubbing, swollen gills, rapid breathing

Also effective against tapewormsYes

The protocol

Dosing days (days)3 days

Litres treated per 20 ml bottle, full course (L)300 L

50% water change after 24 hoursNo

Second treatment 14 days laterNo

Around the treatment

Can be given alongside other treatments in the rangeYes

In the shop

eSHa NDX dewormer against fish nematodes

The worm you are looking for

Where it attachesIn the gut

What you seeA red thread hanging from the vent

Also effective against tapewormsNo

The protocol

Dosing days (days)1 days

Litres treated per 20 ml bottle, full course (L)225 L

50% water change after 24 hoursYes

Second treatment 14 days laterYes

Around the treatment

Can be given alongside other treatments in the rangeNo

In the shop

Doses, treatment durations, volumes treated and compatibilities taken on 19/09/2026 from the eSHa Labs instruction leaflets and on 11/10/2026 from the eSHa gdex and eSHa ndx product pages.

Estimate your
delivery time

Small bottle shipped by tracked parcel from France, together with the rest of your order. The exact costs and delivery times are shown in the basket once the address has been entered. Outside the European Union, import duties and taxes are payable by the recipient. Once unsealed, this product can no longer be returned under the right of withdrawal (article L221-28, 5° of the French Consumer Code), for reasons of hygiene and health protection.

Frequently asked questions

6 questions

6 key questions

How do I calculate my drops?

The dose is counted per litre, not per 100 litres.

Work out your real water volume: length times width times water depth in centimetres, divided by 1,000.
On the first day, add as many drops as there are litres.
On the second and third days, add half that number.

A 120-litre tank needs 120 drops on the first day, then 60 on each of the next two. With a syringe, allow 100 drops for 3.2 ml.

Do my shrimp need to be taken out of the tank?

How can you tell a gill worm from a skin worm?

Sign	More likely the skin	More likely the gills
Rubbing	Frequent	Present
Breathing	Normal at first	Rapid, gill cover beating
Mucus	Visible excess on the flanks	Barely visible
Position	All over the tank	Under the filter outlet

Both are treated with the same course, so the distinction is mainly useful for monitoring progress.

Can the treatment be repeated?

And on an aquaponic system?

What can I do to prevent another infestation?

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eSHa GDEX treatment against skin and gill worms

The summary