Delivery throughout the EU
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MasterLine Carbo – Liquid Carbon Source for Planted Aquariums

Trusted by 500+ aquascapers

€6,06
  • Extra carbon without a CO2 system
  • Helps against GSA, BGA and staghorn
  • Works with or without CO2 injection
  • Safe for shrimp and all livestock
  • Graduated cup included, 2.5-20 ml

Carbon your plants take in straight through their leaves, and the simplest way to push growth in a tank with no CO2 system. Dose it daily around lights-on and it also works against green spot, blue-green and staghorn algae.

Size

Fast delivery (1–5 days EU)

Carefully packed and protected

Tips from real aquascapers

Description

MasterLine Carbo is a liquid organic carbon supplement for planted aquariums. It provides an additional source of carbon — the primary building block of plant biomass — that aquatic plants can absorb directly through their leaves. In aquariums without CO₂ injection, it supports plant growth and helps reduce algae. In CO₂-injected aquariums, it can be used as a complementary supplement for additional growth support and algae inhibition.

MasterLine Carbo is recommended for daily dosing and works best when dosed during the lighting period (5–10 minutes before or shortly after lights turn on), when plants are actively photosynthesizing.

Key benefits

  • Liquid carbon source — supports photosynthesis and plant growth
  • Helps reduce algae growth, including GSA, BGA, and staghorn algae
  • Suitable for tanks with and without CO₂ injection
  • Safe for all aquatic life including shrimp
  • Includes graduated measuring cup (2.5–20 ml)

Dosing

  • Daily dosing recommended
  • Dose during or shortly before the lighting period
  • Best used in combination with MasterLine I + II or an All In One formula

Pair with

  • MasterLine I + II — complete two-part fertilizer system
  • MasterLine All In One Golden or Boost — for AIO users

  • Professional support

    Expert help when you need it

  • Delivery throughout the EU

    Delivery to all EU countries

  • Secure payment

    Fast and secure payment options

  • Easy returns

    Лесно връщане и замяна
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FAQ

What makes Aquarium Boutique different from mass-market stores?

We don't sell everything — we sell only carefully selected products, personally tested. Every item is chosen with a clear purpose: to work well and last long. You don't need to guess about quality — we've already done that for you.

Do you ship to my country?

Yes, we ship across all of Europe. For Bulgaria we work with BOX NOW and Speedy — fast and reliable home or locker delivery. For other EU countries we use international courier services.

How quickly will I receive my order?

For orders within Bulgaria, we typically deliver within 1–3 business days. For other EU countries — usually 3–7 business days depending on location.

Can I return a product if I'm not satisfied?

Yes. If something doesn't meet your expectations — contact us. We have a clear and fair return policy. Your satisfaction matters to us and we will find a solution.

Do you offer advice on product selection?

Absolutely. Our team keeps aquariums and knows the products personally. Write to us — we'll help you choose the right solution for your tank, budget and experience level.

Are your products tested and approved?

Yes. Every product in our store has gone through our personal selection and testing process . We only work with trusted brands and don't list products we don't believe in.

What payment methods do you accept?

We accept all major payment methods — credit and debit cards, PayPal, and cash on delivery for Bulgaria. All payments are secure and encrypted.

How can I track my order?

After your order ships, you'll receive an email with a tracking link. You can follow the status in real time directly through the courier's website.