Rosy Bitterling fish is one of the most entertaining for a freshwater aquarium. They entertain the aquarists with their coloration, schooling behavior, and adjustability in a community tank. If you are also thinking about their stocking and their presence in your tank, read the following article. You’ll learn about their basic profile, behavior, and how many rosy bitterling fish are in a tank. Moreover, a step-by-step rosy bitterling stocking guide is also here.
Content Table
rosy bitterling
What is Rosy Bitterling
Rosy bitterling is a small freshwater fish that is popular among aquarists. Aquarists love it for its peaceful behavior, coloration, and unique breeding behavior. Moreover, they are suitable for a community fish tank. Here is a brief profile of the rosy bitterling fish.
| Feature | Explanation | |
| Common Name | Rosy bitterling | |
| Scientific name | Rhodeus ocellatus | |
| Distribution | China, Japan, Taiwan, Russia, Fiji, South Korea, and Uzbekistan | |
| Habitat | Owland rivers, lakes, ponds, reservoirs, canals, and marshes with sandy or silty substrates, dense vegetation, and importantly, a population of freshwater mussels. | |
| Average Size | female | 4 to 5 cm |
| Male | 5 to 8 cm | |
| Average Age | 3 to 4 years | |
| Temperament | Peaceful, shy, and shoaling | |
| Suitable tank | Spacious, mature, and well-filtered subtropical aquarium with a strong current and ample hiding places | |
| Average tank size | 20+ gallons is optimal. However, it can go with 10-gallon tanks. | |
| Suitable tank mates | Danios
Small barbs (peaceful types) |
|
| White Cloud Mountain Minnows | ||
| Shubunkins or small goldfish (cool-water compatible) | ||
| Corydoras | ||
| Care level | Easy and suitable for beginners | |
Are Bitterling Fish Aggressive?
Bitterlings have about 40 species, while the rosy bitterling is a specific fish species. Bitterlings are generally, and rosy bitterlings are especially, peaceful fish.
Bitterling Behavior
They swim in groups and can co-exist with similar-nature fish. Usually, they swim in the middle to upper water column. A group of at least 6 fish is the bare minimum to show their peaceful behavior, as a single fish can become stressed or timed.
Unlike many other species, they don’t establish and defend their boundaries and area. Moreover, they don’t bully others in general. However, they rarely become bully or aggressive towards others.
Rosy Bitterling Temprament
Rosy bitterlings are calm and peaceful. They are non-aggressive. Here are some other behavioral attributes of the rosy bitterling.
- Calm swimming
- Schooling with the same nature as fish
- Don’t nip the fins of others
- They don’t chase others, except during the breeding season
- Planted tanks with calm, cool, and slow-moving waterhelp them thrive and brighten their coloration.
How many rosy bitterling fish
Rosy Bitterling Fish Stocking Calculation
Rosy bitterlings are small and schooling fish, so you can keep them in a school. You can keep them from 10 gallons onward in large tanks with some other fish. Generally, a group of 6 is the minimum requirement.
Stocking Formula
There are 3 levels of fish stocking, i.e., conservative, moderate, and liberal. The conservative formula is better for beginners, the medium for somewhat experienced, and the liberal stocking formula works for pros. Here are the formulas for different levels according to the volume.
Gallon to Litter Conversion
Liters = Gallons × 3.785411784
Stocking Formulas
| Stocking Level | Formula |
| Conservative | |
| Moderate | |
| Liberal |
Conversion Example
If you have a 20-gallon fish tank, here is the calculation for stocking 5 cm rosy Bitterling.
Litter = 20*3.785411784
Litter = approximately 76
Conservative Stocking Level = 76/(5*2) = approximately 8 Rosy Bitterling
Moderate Stocking Level = 76/(5*1.5) = approximately 10 Rosy Bitterling
Liberal Stocking Level = 76/(5) = approximately 15 Rosy Bitterling
Stocking Table
| Tank Size (L) | Tank (US gal) | Conservative | Moderate | Liberal |
| 40 L | 10.57 gal | 4 | 5 | 5 |
| 54 L | 14.27 gal | 5 | 7 | 7 |
| 60 L | 15.85 gal | 6 | 8 | 8 |
| 75 L | 19.81 gal | 7 | 10 | 10 |
| 100 L | 26.42 gal | 10 | 13 | 13 |
| 120 L | 31.70 gal | 12 | 16 | 16 |
| 200 L | 52.83 gal | 20 | 27 | 27 |
Decorating the Fish Tank for Your Rosy Bitterling
If you want to build and decorate the fish tank for your rosy bitterling, here is a step-by-step guideline.
Gather The Goods
- 20+ gallon fish tank
- Sponge and low-flow HOB/canister filter
- Fine sand or smooth, rounded gravel for substrate
- Live plants, i.e., Java fern, anubias, vallisneria, hornwort, elodea, floating plants
- Decorations, i.e., driftwood, smooth rocks, and caves
- Water testing kit
- Water conditioner
- Thermometer
- Aquarium lighting
- Net
- Siphon
- Bucket
- Sponge prefilter
Plan
Decide the tank size according to the number of rosy butterlings and other fish. Make a blueprint of the tank, showing where to place plants, decorations, etc.
Lay the Substrate and Hardscape
Add up to 2 inches of substrate at the bottom. Add the hard scape according to the plan at the bottom.
Plantation
Transplant the plant in the tank according to the layout, front, middle, and back. Place them according to the plant height. It’d be better to add the floating plants to control the lighting.
Fish Tank for Your Rosy Bitterling
Filter and Flow
If your tank is small, say 10 gallons, install a sponge filter. Otherwise, an HOB or canister filter is a good option to keep your tank clean. Moreover, Rosy Bitterling loves to move in a gentle water flow and a well-oxygenated tank. Install an air stone that makes them comfortable.
Light and Temperature
Rosy bitterling requires a moderate lighting environment. So install a moderate light that remains on for 6 to 8 hours daily in the tank. In terms of temperature, they are comfortable with the room temperature, i.e., 25 degrees Celsius. However, if you are in a cold region or want to avoid any mishap, install a heater with a thermostat. Maintain the temperature between 18–24 °C.
Water Treatment and Tank Filling
Dechlorinated water with a pH of 6.5 to 7.5 is a haven for the Rosy bitterling. If you maintain its hardness between 4 – 12 °dH, it’ll help them a lot. Prepare a water volume that fills 70% of your tank. Once you are ready, gently pour it into the tank.
Tank Cycle
It’s time to cycle your tank. Turn on the biological filter and seed an ammonia source. Fish food, decaying food, or commercial ammonia are some nitrogen cycle starters. Once you are done, check the water parameters after every 2 to 3 days. Don’t add the fish until the results are as follows,
| Nitrite | 0 ppm |
| Ammonia | 0 ppm |
| Nitrat | <10 ppm |
Fish Quarantine
Meanwhile, you are doing the cycling, quarantine the fish instead of direct introduction to the main tank. It’ll give you insights into the fish’s health and also help you to avoid disease spread in the main tank.
Rosy Bitterling Fish Stocking Calculation
Fish Introduction to the Main Tank
Acclimate the fish to the main tank’s water conditions. After acclimation, introduce the fish into the tank. Maybe you feel some lazy behavior in the early days. However, it’ll be fine later on.
Maintenance
For the first two weeks, closely watch the fish and promptly respond to any unique situation. After that, go to the regular maintenance cycle. It includes
| Frequency | Tasks |
| Daily | Quick visual check of fish and equipment |
| Remove uneaten food after 10–15 minutes | |
| Feed 2 to 3 times daily in such a quantity that the fish consume within 1 to 2 minutes | |
| Twice Weekly | Light siphoning around plants to avoid detritus collection |
| Weekly | Perform a 20–30% water change |
| Lightly vacuum substrate | |
| Check filter intake for debris | |
| Monthly | Rinse the sponge filter media in the tank water |
| Trim plants | |
| Clean aquarium glass | |
| Every 3 Months | Partial deep clean of filter media |
| Inspect all equipment for wear or malfunction |
In Summary
Rosy bitterlings are small freshwater fish that grow up to 5 cm long and are suitable for small tanks with more than 20 gallons. They live in a school of 6 and can even go with other peaceful fish species. In a 10-gallon tank, almost 5 rosy bitterlings can live comfortably. To enjoy their presence, follow the step-by-step procedure and enjoy with Rosy Bitterling.
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