Can mollies and bristlenose plecos live together?
With care
Mollies and bristlenose plecos can share a tank, but there is something to watch.
Why
- Their pH ranges only meet at 7.5, which leaves no margin.
What each one needs
| Molly | Bristlenose pleco | Both | |
|---|---|---|---|
| Temperature | 72–82°F (22–28°C) | 73–81°F (23–27°C) | 73–81°F (23–27°C) |
| pH | 7.5–8.5 | 6.5–7.5 | 7.5–7.5 |
| Minimum tank | 20 gal (76 L) | 29 gal (110 L) | 29 gal (110 L) |
| Keep at least | 3 | 1 | |
| Adult size | 4 in (10.2 cm) | 5 in (12.7 cm) |
The smallest tank for both
A 29 gallons (110 L) tank holds 3 mollies and 1 bristlenose pleco at about 48% of its stocking limit, which leaves room for more.