Can Koi Angelfish live with Flash Pleco (L204)?
Light caution
Why
- Only a narrow water hardness overlap — keep both around 6–7.5 dGH.
- Large size gap (Flash Pleco (L204) 20" vs Koi Angelfish 6") — watch that the smaller one gets its share at feeding time.
Sweet spot: both do well at 78–82°F and pH 6.5–7.5 — aim there.
Side-by-side
| Koi Angelfish | Flash Pleco (L204) | |
|---|---|---|
| Temperature | 78–84°F | 72–82°F |
| pH | 6–7.5 | 6.5–7.6 |
| Hardness (GH) | 3–12 dGH | 6–7.5 dGH |
| Adult size | 6" | 20" |
| Temperament | Peaceful | Peaceful |
| Min tank | 30 gal | 125 gal |
Together, plan on at least 125 gallons.
How to make it work
- Target the overlapping water-parameter range and acclimate slowly.
Sort it with: GH remineraliser
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Design a tank with Koi Angelfish, Flash Pleco (L204) →Everything compatible with Koi Angelfish · …with Flash Pleco (L204)