Neon Blue Rasbora
Neon Blue Rasbora
Neon Blue Rasbora (Sundadanio goblinus) is one of the most intensely blue nano fish available — the body displays an almost electric blue iridescence that, in a properly lit blackwater setup, appears to glow from within. One of three closely related species in the Sundadanio genus (with the Cardinal and Neon Red Rasboras), all sharing the same peat swamp origins and blackwater requirements.
Feeding & Care Tip: Hikari Micro Pellets (crushed or soaked briefly) and Sera Vipan Baby make excellent daily staples. Supplement 2–3× per week with Hikari Frozen or Freeze-Dried Baby Brine Shrimp and Hikari Frozen Daphnia. Feed small amounts 2–3 times daily.
Native to the blackwater peat swamp forests of Borneo and surrounding Southeast Asian islands. The name goblinus — meaning 'goblin' — was given to this mysterious, rarely-seen dweller of dark peat swamp waters. Extremely soft, acidic, tannin-stained water is the natural habitat.
Keep in groups of at least 10 in a blackwater nano setup. The electric blue iridescence is most vivid in well-conditioned fish in soft, acidic water with tannin additions and a dark substrate. Any larger fish will stress them.
The three Sundadanio species — Blue, Red, and Cardinal — can be mixed in a single blackwater nano aquarium for a spectacular three-species display, all sharing identical care requirements.
Care & Ideal Parameters
| Difficulty | Easy — Moderate |
| Temperament | Peaceful — nano blackwater community |
| Typical Adult Size | 1.0 inch (2.5 cm) |
| Min. Group Size | 10 minimum |
| Ideal Temp | 73–82°F (23–28°C) |
| Ideal pH | 4.0–7.0 |
| Ideal GH | 0–10 dGH |
| Ideal KH | 0–5 dKH |
| Staple Food | Hikari Micro Pellets (crushed/soaked); Sera Vipan Baby |
| Treat / Supplement | Hikari Frozen or Freeze-Dried Baby Brine Shrimp; Hikari Frozen Daphnia |
| Origin | Blackwater peat swamp forests of Borneo and surrounding Southeast Asia |
| Notes | Goblinus = 'goblin'. Electric blue iridescence — most vivid in tannin water. One of three Sundadanio species. Mix with Neon Red and Cardinal for three-species display. |
