Aquarium fish come in various breeds, each with unique colors, shapes, behaviors, and breeding requirements. Here are the 10 most popular aquarium fish (2025)
1. Angelfish
Angelfish are popular for their graceful shape and are ideal for intermediate-level aquarists due to their specific tank and water needs. 10 most popular aquarium fish (2025) list Angelfish position is Top
| Level | Information |
|---|---|
| Name: Angelfish | Scientific Name: Pterophyllum scalare |
| Size: | Up to 6 inches in length and 8 inches in height |
| Lifespan: | 10–15 years with proper care |
| Water Conditions: | Prefers soft, slightly acidic water (pH 6.0–7.5) and a temperature range of 75–82°F |
| Tank Requirements: | 20+ gallons for a single fish, with tall plants and soft substrate |
2. Goldfish
| Level | Information |
|---|---|
| Name: Goldfish | Scientific Name: Carassius auratus |
| Size: | 6–14 inches, depending on the type and environment |
| Lifespan: | Up to 10–15 years with good care |
| Water Conditions: | Updateable |
| Tank Requirements: | 20+ gallons per fish, with strong filtration due to their waste production |
3. Guppy Aquarium Fish
| Level | Information |
|---|---|
| Name: Guppy | Scientific Name: Poecilia reticulata |
| Size: | 1.5–2 inches |
| Lifespan: | 2–3 years |
| Water Conditions: | Updateable |
| Tank Requirements: | 5+ gallons for small groups; larger tanks allow for active swimming |
4. Zebrafish (Danios) Aquarium Fish
| Level | Information |
|---|---|
| Name: Zebrafish (Danios) | Scientific Name: Danio rerio |
| Size: | 2 inches |
| Lifespan: | 3–5 years |
| Water Conditions: | Updateable |
| Tank Requirements: | 10+ gallons, but prefer larger spaces for swimming |
5. Oscar Fish
| Level | Information |
|---|---|
| Name: Oscar Fish | Scientific Name: Astronotus ocellatus |
| Size: | 12–18 inches |
| Lifespan: | 10–15 years or more |
| Water Conditions: | Updateable |
| Tank Requirements: | 155+ gallons per fish, strong filtration needed |
6. Molly Fish
| Level | Information |
|---|---|
| Name: Molly Fish | Scientific Name: Poecilia sphenops |
| Size: | 3-4 inches (7.5-10 cm) for the common molly. |
| Lifespan: | 3-5 years |
| Water Conditions: | Temperature: 72-82°F (22-28°C) pH: Slightly alkaline, around 7.5-8.5 Hardness: 10-25 dGH |
| Tank Requirements: | Minimum Tank Size: 20 gallons for a small group. |
7. Betta (Siamese Fighting Fish)
| Level | Information |
|---|---|
| Name: Betta Fish | Scientific Name: Betta splendens |
| Size: | 2.25-3 inches (5.5-7.5 cm) |
| Lifespan: | 3-5 years |
| Water Conditions: | Temperature: 76-82°F (24-28°C), as they are tropical fish and need warm water. pH: Slightly acidic to neutral, around 6.5-7.5. Water Hardness: Soft to moderate, 3-5 dGH. |
| Tank Requirements: | Minimum Tank Size: 5 gallons (19 liters) per betta, though larger tanks are better. |
8. Lionfish
| Level | Information |
|---|---|
| Name: Lionfish | Scientific Name: Pterois volitans and Pterois miles |
| Size: | 12-15 inches (30-38 cm) |
| Lifespan: | 10-15 years |
| Water Conditions: | Temperature: 72-78°F (22-26°C) pH: 8.1-8.4 |
| Tank Requirements: | Minimum Tank Size: 50 gallons (189 liters) |
9. Neon Tetras Aquarium Fish
| Level | Information |
|---|---|
| Name: Neon tetras Aquarium | Name: Neon Tetras Aquarium |
| Size: | 1-1.5 inches (2.5-4 cm) |
| Lifespan: | 5-8 years |
| Water Conditions: | Temperature: 70-81°F (21-27°C) pH: Slightly acidic to neutral, around 6.0-7.0 Water Hardness: Soft to moderately hard, 2-10 dGH |
| Tank Requirements: | Minimum Tank Size: 10 gallons (37 liters) |
10. Platy Aquarium Fish
| Level | Information |
|---|---|
| Name: Platy Aquarium Fish | Scientific Name: Xiphophorus maculatus |
| Size: | 2-3 inches (5-7.5 cm) |
| Lifespan: | 3-5 years |
| Water Conditions: | Temperature: 70-78°F (21-26°C) pH: Slightly alkaline to neutral, around 7.0-8.0 Water Hardness: Moderately hard, 10-28 dGH |
| Tank Requirements: | Minimum Tank Size: 10 gallons (37 liters) |
