Dwarf baby tears (Hemianthus callitrichoides ‘Cuba’), usually shortened to HC Cuba, is the smallest-leaved and finest aquarium carpet, and also the most demanding. It produces the dense, manicured green lawn behind countless contest tanks, but it needs high light and pressurised CO₂ to get there, which puts it firmly in advanced territory.
What HC Cuba demands
- Latin name: Hemianthus callitrichoides ‘Cuba’
- Type: carpet / foreground
- Light: high
- CO₂: required
- Difficulty: advanced
- Growth rate: medium
Growing HC Cuba
Plant tiny portions across the substrate and give it bright light and pressurised CO₂ from the start. Under the right conditions it forms a remarkably fine, dense carpet. Under the wrong ones it grows leggy, lifts away from the substrate and melts. It is the classic high-tech carpet that punishes shortcuts. A nutrient substrate and stable conditions matter more here than with any other carpet.
Is it the right carpet for you?
Be honest about your setup. HC Cuba is an advanced, high-tech plant. Without strong light and CO₂ it will fail, and no amount of patience substitutes for those. If you’re starting out or running low-tech, Monte Carlo gives a similar look with far more forgiveness, and dwarf hairgrass is the grassy middle ground. Come to HC once your tank is dialled in. The carpet plants guide lays out the full easy-to-hard order.
HC Cuba questions
Is dwarf baby tears hard to grow?
Yes. It is an advanced plant. It needs high light and pressurised CO₂ to carpet, and it melts or grows leggy without them, so it isn’t a beginner’s carpet.
Can you grow HC Cuba without CO₂?
Effectively no. CO₂ is required for it to form a carpet. Without it the plant struggles, detaches and typically fails rather than spreading.
HC Cuba or Monte Carlo?
HC Cuba gives a finer, denser carpet but is advanced. Monte Carlo is larger-leaved, more forgiving and the better starting point. Most people are happier beginning with Monte Carlo and moving to HC later.