Odessa Barb (Pethia padamya)

You must maintain a minimum school of 8 to 10 individuals in a tank of at least 30 gallons (113 liters) with a footprint of 36 by 12 inches (90 by 30 cm). Odessa Barbs (Pethia padamya) are schooling fish that develop their spectacular crimson-red lateral stripe only when kept in groups with competing males and multiple females. Groups under 6 cause faded colors, chronic stress, and occasional fin-nipping. A school of 10 to 15 produces the most confident behavior and maximum color intensity. Maintain a male-to-female ratio of 1 to 2 or 1 to 3. Provide open swimming lanes in the center with dense plant borders along the sides and rear. Tank length must exceed 30 inches (75 cm) to accommodate their active mid-water swimming. Dark substrate is essential; light gravel causes washed-out coloration.

Target pH 6.5 to 8.5, General Hardness 5 to 20 dGH, Carbonate Hardness 4 to 10 dKH, Total Dissolved Solids 120 to 300 ppm, Electrical Conductivity 240 to 600 microS/cm, and temperature 68 to 79 degrees Fahrenheit (20 to 26 degrees Celsius). They are remarkably adaptable but prefer well-oxygenated water with moderate current. Maintain nitrates below 15 ppm with weekly 25% water changes. Use a canister or hang-on-back filter with moderate flow at 4 to 5 times turnover per hour. Provide smooth gravel or sand substrate. Hardness below 4 dGH causes clamped fins and reduced coloration. Temperatures consistently above 78 degrees Fahrenheit (26 degrees Celsius) can stress them over time and suppress immune function. In many homes, an unheated tank at room temperature (68 to 72 degrees Fahrenheit or 20 to 22 degrees Celsius) is ideal. They require higher oxygenation than typical tropical fish; provide an airstone or sponge filter for surface agitation.

They are omnivores requiring 40% protein, 10% fat, and 50% plant matter. Feed high-quality tropical flakes, sinking micro-granules, frozen bloodworms, brine shrimp, and daphnia twice daily. Offer spirulina flakes, algae wafers, and blanched spinach or zucchini weekly. Live or frozen foods are essential for bringing out the males' deepest red coloration; males fed only basic flakes never reach full color potential. Feed small amounts two to three times per day rather than one large feeding. Medication alert: Tolerate copper sulfate at 0.2 mg/L and formalin. Praziquantel is safe for trematodes. Salt baths up to 5 ppt treat external parasites. They are susceptible to Camallanus worms (Camallanus cotti), a nematode visible as thin red threads protruding from the vent. Treat with Levamisole Hydrochloride at 2 mg/L in the water or mixed into food. Turn off lights during treatment as Levamisole degrades in light. Perform a 70 to 80% water change and vacuum the substrate 24 hours after dosing. Repeat treatment every 2 to 3 weeks for a total of 2 to 3 treatments to break the life cycle. Quarantine new fish for 14 days and observe for red threads at the vent.

Select 10 to 12 mature fish with a 1 male to 2 female ratio and condition with live blackworms, brine shrimp, and high-quality frozen foods for 2 weeks. Set up a 20-gallon (75 liter) breeding tank with 5 inches (12 cm) of water depth, pH 6.8, dGH 6, and temperature 72 to 75 degrees Fahrenheit (22 to 24 degrees Celsius). Add fine-leaved plants such as java moss, Myriophyllum, or a spawning mop. Cover the bottom with a plastic mesh of 0.25 inch (6 mm) grid so eggs fall through beyond parental reach. A partial water change with slightly cooler water stimulates spawning. Males display intensely, flaring fins and showing deepest red coloration to attract females. Spawning typically occurs at dawn; the female scatters 200 to 300 adhesive eggs among the plants or through the mesh. Remove parents immediately after spawning; they are eager egg predators. Eggs hatch in 24 to 36 hours at 72 degrees Fahrenheit (22 degrees Celsius). Fry absorb yolk sacs for 1 to 2 days, then become free-swimming. Feed infusoria or commercial liquid fry food for the first week, then graduate to baby brine shrimp and microworms. Growth is steady; young fish show color differences between males and females at 8 to 12 weeks of age. For optimal fry growth, perform 3 times daily 50% water changes with aged, temperature-matched water.