High-End Planted Aquascape Budget: What Does a CO2 Tank Really Cost?
A high-end planted tank, known as an "aquascape," with diffused CO2 and a nutrient substrate, typically costs between 400 and 900 euros for a 60 to 120-litre tank, fish excluded — two to three times the budget of a basic planted tank without CO2. That price gap is justified: CO2 changes the game for plant growth, as shown in an older but still widely cited study by Madsen and Sand-Jensen on carbon assimilation in aquatic macrophytes (research on Google Scholar), which explains why demanding plants stall without a carbon source. Find our other pointers in the bedding and habitat section and on the fishkeeping hub.
What's the single biggest expense?
Technical nutrient substrate (aqua soil) tops the list: plan for 40 to 80 euros for a 60-litre tank depending on the brand, versus 10 to 15 euros for plain gravel. It feeds root systems and stabilises pH without constant intervention, a choice detailed in our guide CO2 in a planted tank.
Do you need pressurised CO2, or is liquid carbon enough?
For a true aquascape with demanding plants (Hemianthus, fine-leaved Rotala), a pressurised CO2 kit (cylinder, regulator, diffuser) costs 120 to 250 euros upfront, plus a few euros for a refill every two to three months. Liquid carbon, less effective but equipment-free, runs 10 to 15 euros a month with regular use: a top-up option rather than a real substitute on a technical tank.
What budget for lighting?
Demanding plants need strong, well-tuned-spectrum lighting, costing 60 to 150 euros depending on power and tank surface area. Under-powered lighting is the most common mistake: plants stall, algae take over, and part of the CO2 budget goes to waste.
Can you build an aquascape gradually to spread out the cost?
Yes: starting with liquid carbon and decent lighting, then adding pressurised CO2 once the tank has settled, is a reasonable approach for a first aquascape, as shown in our guide easy aquascaping for beginners. The nutrient substrate, on the other hand, needs to be chosen upfront: changing it later means starting the whole tank over.
- Technical nutrient substrate: 40 to 80 euros for 60 litres
- Full pressurised CO2 kit: 120 to 250 euros upfront, then a few euros per refill
- Lighting suited to demanding plants: 60 to 150 euros
- Realistic total budget for a first proper aquascape: 400 to 900 euros, fish excluded
Frequently asked questions
Can you build an aquascape without CO2?
Yes, with undemanding plants (ferns, anubias, mosses), but the dense, colourful layouts typical of aquascaping stay limited without a carbon source.
Does liquid carbon really replace pressurised CO2?
Partially: it helps moderately demanding plants but remains clearly less effective than continuous CO2 diffusion.
How long does a CO2 cylinder last?
Depending on flow rate and tank volume, two to four months of regular use before the first refill.
This guide is part of Planète Pets’s Fishkeeping universe. Our advice is general in nature: for any health concern, your veterinarian remains the only reference.