20 ml bottle A and 10 ml bottle B of PROTALON 707 in front of their blue eSHa box, for 300 litres

Diagram of aquarium algae: filamentous, brush, brown, cyanobacteria and spot green algae

eSHa PROTALON 707 Anti-Algae Treatment

Name: eSHa PROTALON 707 Anti-Algae Treatment
Brand: eSHa
SKU: ESHA79022
Price: 19.0 USD
Availability: InStock

$19.00

This two-bottle anti-algae treatment, an A of 20 ml and a B of 10 ml, treats a planted freshwater aquarium of up to 300 litres. The protocol lasts 7 days and targets filamentous algae, brush algae, blue-green algae and green water.

CO₂ and fertilisers are switched off during the treatment, and snails are removed from the tank. The product is intended for ornamental aquariums only.

Ref. ESHA79022·Algae treatment

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The summary

What you receive: two dropper bottles, an A of 20 ml and a B of 10 ml, with their instructions.
What the treatment targets: filamentous algae, brush algae, blue-green algae and suspended algae in a planted freshwater aquarium.
How long it takes: a 7-day protocol, including 2 days without a dose, then 2 to 6 weeks before the algae disappear completely.
What volume it covers: one full treatment for 300 litres, at the stated dose.
To switch off during the treatment: CO₂ and all plant fertilisers, which also feed the algae.
Shipping: small box, delivered to your door by Colissimo or Chronopost.

7-day course of two bottles, for a planted aquarium of up to 300 litres

The eSHa PROTALON 707 anti-algae treatment is a 7-day course using two bottles, a 20 ml bottle A and a 10 ml bottle B, designed for a planted freshwater aquarium of up to 300 litres. It targets filamentous algae, brush algae, blue-green algae and green water. The first effects appear within a few days, and complete clearance takes 2 to 6 weeks.

This box contains two dropper bottles, a 20 ml A and a 10 ml B, which are added alternately over 7 days to a planted freshwater aquarium. Bottle A acts on the algae, bottle B supports the plants while the algae recede. Together, they treat 300 litres for a full course. You will see the first effects within a few days, and complete clearance takes 2 to 6 weeks depending on the algae and on your water.

🌿 The algae the treatment targets

Before you begin, look at where your algae are and what form they take, as this confirms that the treatment course matches your tank. Filamentous algae and brush algae cling to leaves and decor, blue algae, which are actually cyanobacteria, coat the sand in a slimy film, while suspended algae turn the water itself green. All four forms respond to the same protocol, so you do not need to identify the exact species before treating.

Filamentous algae

Filamentous algae form long green threads that cling to plants and decorations.

Brush algae

Brush algae form black tufts along the edges of the leaves. A small transparent circle may appear in the leaf after the treatment, then disappears within a few days.

Blue-green algae

Blue-green algae form a slimy blue-green film that covers the sand. Suspended algae, the kind that turn the water green, are targeted too.

🧮 The 7-day calendar

The doses are not the same from one day to the next, and two days are dose-free days. For 100 litres, add 50 drops of A on the first day, then 12 drops of A on the second day. On the third day, add 12 drops of A and 10 drops of B. On the fourth and fifth days, add nothing at all. On the sixth day, add 25 drops of A and 20 drops of B. On the seventh day, add 12 drops of A. Measure your actual volume before you begin, by multiplying the length, width and water depth in centimetres, then dividing by 1,000, otherwise all the doses will be wrong.

CO2 and fertilisers are stopped during the treatment

Switch off your CO₂ system and add no plant fertiliser until the 7 days have passed: both of these inputs also feed algae. Remove the activated carbon and resins from the filter, as they would absorb the product, switch off the UV lamp, and let the filter run day and night. Take out any snails, as the treatment may kill them. It is intended only for freshwater ornamental aquariums and excludes animals raised for consumption: on an aquaponic system whose vegetables or fish you eat, this treatment has no place, and the solutions then lie in water balance and lighting.

If your tank measures 80 cm long, 35 cm wide and 40 cm deep in water, 80 × 35 × 40 divided by 1,000 gives 112 litres, which is a coefficient of 1.12 on the schedule designed for 100 litres. On the first day, add 56 drops of A, then 13 drops of A on the second and third days, with 11 drops of B on the third day. Shake each bottle before counting out the drops, and avoid any water change during the 7 days, as it would remove some of the product.

🔍 After the 7 days

The algae do not disappear on the last day of the treatment: they recede over the 2 to 6 weeks that follow. Remove by hand any dead tufts you can reach, which lightens the organic load in your water during this period. Then check your parameters before switching the CO₂ back on and resuming fertiliser, and put fresh activated carbon back in the filter, which will retain any remnants of the product.

📦 Bottle B for maintenance

The box contains both bottles and their instructions. Bottle B is not emptied by the treatment: what is left is then used at a rate of 10 drops per 100 litres each week, to support the plants and delay the return of algae. During and after the treatment, monitor your nitrates and your phosphates, since they are what fed the bloom. When the tank has more algae than plants, the treatment is repeated 14 days after the end of the first one.

Technical specifications

The essentials

Volume treated: 300 L per treatmentThe two bottles together are enough to carry the 7 days through on this volume.
Protocol duration: 7 days, including 2 without a doseNot a single drop on the fourth and fifth days.

What the treatment aims for

Target algae: Filamentous, brush, blue-green, suspended
Time before it disappears: 2 to 6 weeksThe first effects show within a few days, but the job takes longer to finish.

During the treatment

CO2 and fertiliser: Switched off until the seventh dayBoth also feed the algae that the treatment is fighting.
Snails: Removed before startingThe treatment may kill snails in the tank.

To budget for separately

Spare activated carbon: To be put back after the treatmentFresh carbon absorbs any traces of the product left after the course.
Nutrient monitoring: Phosphate test and nitrate test

In the box

1 bottle A of 20 ml
1 bottle B of 10 ml
1 instruction leaflet

Doses, treatment durations, bottle capacities and compatibilities recorded on 19 September 2026 from the eSHa Labs instruction leaflets and the product documentation on the official website. Directions for use taken from the same leaflet.

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.

Two treatments, two problems that are quite different

One deals with the algae that overrun the décor, the other with the film that covers the fish's skin. A first look is enough to decide.

A deposit on the decor is not a deposit on the fish Both can be treated, but not with the same bottle. First look at where the problem is.

	What is covered	Colour of the deposit	The fish change their behaviour	Protocol days (days)	Volume treated per sachet (L)	Number of bottles	CO₂ and fertilisers cancel each other out	The snails are climbing out of the tank	Price
Recommended eSHa PROTALON 707 Anti-Algae TreatmentYour choice	Glass, leaves, sand, decorations	Green, black or blue-green	No	7 days	300 L	2	Yes	Yes	$19.00
eSHa GASTROBAC treatment against slimeYour choice	The skin and gills of fish	Whitish and milky	Yes	3 days	500 L	1	No	Yes	$9.00

eSHa PROTALON 707 Anti-Algae TreatmentRecommended

What you can see in the tank

What is coveredGlass, leaves, sand, decorations

Colour of the depositGreen, black or blue-green

The fish change their behaviourNo

The treatment

Protocol days (days)7 days

Volume treated per sachet (L)300 L

Number of bottles2

During treatment

CO₂ and fertilisers cancel each other outYes

The snails are climbing out of the tankYes

In the shop

eSHa GASTROBAC treatment against slime

What you can see in the tank

What is coveredThe skin and gills of fish

Colour of the depositWhitish and milky

The fish change their behaviourYes

The treatment

Protocol days (days)3 days

Volume treated per sachet (L)500 L

Number of bottles1

During treatment

CO₂ and fertilisers cancel each other outNo

The snails are climbing out of the tankYes

In the shop

Estimate your
delivery time

Small bottle shipped as a tracked parcel, by Colissimo or Chronopost to your home. The exact charges 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.

Frequently asked questions

8 questions

6 key questions, 8 in the detailed view

How do I calculate my drops if my tank isn't 100 litres?

The schedule is given for 100 litres, and it scales to your actual volume.

Measure the length, width and water depth in centimetres, multiply the three together and divide by 1,000.
Divide this volume by 100 to get your coefficient.
Multiply each line of the schedule by this coefficient.

A 60-litre tank gives a coefficient of 0.6: the first day then calls for 30 drops of A instead of 50.

Why do you need to switch off the CO₂ and the fertilisers?

Will my plants suffer?

What should you do with the snails during the treatment?

Can it be used in an aquaponic system?

Should the water be changed before or after?

What should you do if the algae come back?

The rest of bottle B is used for precisely this, at a rate of 10 drops per 100 litres each week. And when a tank holds more algae than plants, the whole course is repeated 14 days after the end of the first one.

A quick return points to an underlying cause. An excess of phosphates, lighting that runs too long or overfeeding should then be corrected first, otherwise the algae will come back after every course.

Can it be mixed with another treatment?

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eSHa PROTALON 707 Anti-Algae Treatment

The summary