Can Guppy live with Flash Pleco (L204)?
Caution — with care
Why
- No overlapping water hardness: Guppy wants 8–20 dGH but Flash Pleco (L204) wants 6–7.5 dGH.
- Very different sizes (Flash Pleco (L204) 20" vs Guppy 2") — these two need different tanks, and the smaller fish will be out-competed at feeding time.
Sweet spot: both do well at 72–82°F and pH 6.8–7.6 — aim there.
Side-by-side
| Guppy | Flash Pleco (L204) | |
|---|---|---|
| Temperature | 72–82°F | 72–82°F |
| pH | 6.8–7.8 | 6.5–7.6 |
| Hardness (GH) | 8–20 dGH | 6–7.5 dGH |
| Adult size | 2" | 20" |
| Temperament | Peaceful | Peaceful |
| Min tank | 10 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 · A larger tank
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