Glass Catfish and Molly Compatibility Overview
Glass Catfish and Molly can potentially coexist, but the combination requires careful attention. Their pH ranges do not meet: Glass Catfish wants 4.0โ7.0 and Molly wants 7.5โ8.5. A larger tank (minimum 55 gallons), dense planting, and close monitoring are essential.
| Factor | Glass Catfish | Molly | Verdict |
|---|---|---|---|
| Temperature | 68โ79ยฐF | 72โ82ยฐF | โ 72โ79ยฐF |
| pH Range | 4.0โ7.0 | 7.5โ8.5 | โ No overlap |
| Temperament | peaceful | peaceful | โ Compatible |
| Adult Size | 2.6 in | 4 in | โ Similar |
| Min. Group | 6+ | 3+ | See below |
| Min. Tank Size | 55 gallons (for both species) | โ | |
Compatibility Positives
Caution Points
Species Profiles
Glass Catfish โ Kryptopterus vitreolus
The Glass Catfish, Kryptopterus vitreolus, is a popular freshwater aquarium fish known for its unique, translucent body and iridescent scales. It is a peaceful species that thrives in groups and is suitable for beginners due to its hardy nature. These catfish are bottom-dwellers and require a well-decorated tank with plenty of swimming space.
โ Full Glass Catfish care guide
Molly โ Poecilia sphenops
Hardy livebearers that prefer alkaline, hard water โ sometimes slightly brackish. Prolific breeders; peaceful community fish.
Frequently Asked Questions
Can Glass Catfish live with Molly?
With significant caution and a larger tank. Glass Catfish and Molly can potentially coexist, but the combination requires careful attention. Their pH ranges do not meet: Glass Catfish wants 4.0โ7.0 and Molly wants 7.5โ8.5. A larger tank (minimum 55 gallons), dense planting, and close monitoring are essential.
What tank size do I need for Glass Catfish and Molly together?
A minimum of 55 gallons is recommended for keeping Glass Catfish and Molly together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Glass Catfish and Molly?
72โ79ยฐF โ inside Glass Catfish's 68โ79ยฐF and Molly's 72โ82ยฐF.
Is a Glass Catfish aggressive toward a Molly?
Glass Catfish is peaceful and Molly is peaceful. No major aggression issues are expected between these species.
Related Compatibility Guides
Tank Size for Glass Catfish and Molly
Use the scenario that matches the actual group sizes and temperament you plan to keep.
| Scenario | Tank | When it applies |
|---|---|---|
| Minimum viable | 55 gal | Only for the recommended minimum groups, mature filtration, and close monitoring. |
| Recommended community | 75 gal | Adds territory, swimming room, and a safer buffer for behavior. |
| Low-conflict setup | 125 gal | Best when keeping larger schools or reducing territorial pressure. |