Your cart is empty.

MasterLine II

MasterLine II

  • Macronutrient allround fertiliser
  • Contains nitrogen, phosphorus, potassium and magnesium
  • Daily or weekly dosing
  • Recommended use with MasterLine I and MasterLine Carbo
In stock, only 18 left
Free shipping on orders over € 50.- within Germany Change region
Express delivery possible
2-4 business days - order within the next 25 minutes and we’ll deliver Wednesday at the earliest
I want to order to 

Please choose a variant

Item question

We’re here for you!

Please enter your question and e-mail and we’ll contact you as soon as possible. It usually takes us up to 24 hours during business days to respond.

Thank you for your question!

Thank you, we’ll get in touch!

Close window

You already sent us a question.

Please wait a few minutes


MasterLine II is a concentrated macronutrient fertiliser for aquatic plants. It contains nitrogen, phosphorus, potassium and magnesium. It is recommended to use MasterLine II together with MasterLine I and MasterLine Carbo. In this way the aquatic plants have all the nutrients necessary for healthy growth. MasterLine II offers the possiblity of dosing on a weekly basis.


  • Available in 500 ml, 1.000 ml and 5.000 ml unit sizes
  • Contains nitrogen, phosphorus, potassium and magnesium
  • The full macronutrient supply
  • Daily or weekly dosage
  • Suppresses GSA, BGA and staghorn algae


Daily dosage
Lots of light (>0.5 Watt per litre) + CO2 1 ml per 30 litres*
Little light (<0.5 Watt per litre) + CO2 1 ml per 50 litres*
Weekly dosage
Lots of light (>0.5 Watt per litre) + CO2 7 ml per 30 litres*
Little light (<0.5 Watt per litre) + CO2 7 ml per 50 litres*

(*1 ml per 30 litres = 1.20 mg/l NO3, 0.2 mg/l PO4, 1.6 mg/l K, 0.12 mg/l Mg)

The recommended dosage is only a guideline. Depending on the aquarium, the dosage of the fertiliser can be reduced or increased to achieve optimum results.


Use in combination with activated carbon or UV lamps is not recommended, as the use of these substrates or tech can alter the nutrient properties. Shake bottle well before use. Store in a cool place without direct sunlight.


General information

Please choose a variant to see more information.

Item no.
Shipping weight

Customer reviews

This item has been rated 5 out of 5 stars
One review
Please sign in if you want to write a review. Sign in
5 Stars(1)
4 Stars(0)
3 Stars(0)
2 Stars(0)
1 Star(0)
roland k.
Must have
20th August 2020
MasterLine - II - 500 ml
MasterLine - II - 500 ml

Sensational fertilizers!Even difficult to grow plants grow healthily and beautifully.A fertilizer worth its price in 100 percent,Ludwigia pantanal and eriocaulon love it for me. (read more)