Blue discus
Symphysodon aequifasciatus
The blue discus has a disc-shaped, laterally compressed body with long dorsal and anal fins. Its base coloration is electric blue with darker vertical stripes. Many selected varieties exist. It is a schooling fish that lives in groups. It is sensitive to stress and requires impeccable water quality. Adults reach up to 15 cm in diameter.
Recommended parameters
| Parameter | Recommended range |
|---|---|
| Temperature | 28–30 |
| pH | 5.5–6.5 |
| GH | 1–4 |
| KH | 1–3 |
| NO₃ | ≤ 5 |
| PO₄ | ≤ 0.1 |
Care
Care notes
Keep discus in groups of at least 5 in a minimum 300 L aquarium. Water must be very acidic (pH 5.5-6.5) and very soft (GH 1-4). Ideal temperature is 28-30°C. Weekly 30% water changes are essential. The setup should include roots, robust plants, and a dark substrate. They are carnivorous: feed quality frozen foods (artemia, bloodworms) and specific pellets. Avoid aggressive fish; tetras and corydoras are good tankmates.