Ceylon Stone Sucker (Garra ceylonensis) 

Species Profile:

• Origin: Found exclusively in Sri Lanka, ranging from lowland rivers to the high-altitude streams of the Central Highlands.
• Habitat: They inhabit clear, oxygen-rich running waters with rocky substrates.
• Conservation Status: Currently listed as Vulnerable on the IUCN Red List due to habitat loss from deforestation and hydroelectric projects. It is essential to ensure specimens are sourced from ethical suppliers. 

• Size: Adult specimens typically reach 12–15 cm in length.
• Mouthpart Morphology: Features a specialized suctorial disc on the chin (the mental disc). This allows the fish to anchor itself to rocks in torrential currents while grazing on biofilm and periphyton.
• Body Shape: Sub-cylindrical and streamlined, with flattened ventral surfaces to minimize drag.
• Colouration: Generally a cryptic olive-brown to bronze, often displaying a faint lateral stripe and reddish tints in the fins when maintained in peak condition.

• Tank Size: A minimum of 120 litres with a long footprint (e.g., 90cm – 120cm) to allow for swimming space and oxygen exchange.
• Water Parameters:
  • Temperature: 20°C – 26°C (Requires a seasonal cooling period; avoid constant high tropical temperatures).
  • pH: 6.5 – 7.5.
  • Hardness: 5 – 15 dGH.
• Water Quality: Exceptional oxygenation is mandatory. Use powerheads or a river manifold system to create a unidirectional flow. High nitrate levels are poorly tolerated.
• Substrate: Use smooth river stones, cobbles, and varied grades of gravel. Avoid sharp sand which can irritate their ventral surface. 

• Grazing: High-intensity lighting is recommended to encourage natural green algae growth on rocks.
• Supplementary Feeding: Offer high-quality sinking wafers, spirulina tabs, and occasional live/frozen foods such as bloodworms or white mosquito larvae.
• Note: They are highly active and require more frequent feeding than sedentary bottom-dwellers. 

• Social Structure: Semi-aggressive and highly territorial towards their own kind. In smaller tanks, it is best kept singly. In very large setups (150cm+), a group of 6 or more can be kept to disperse aggression.
• Tankmates: Choose robust species that enjoy high flow, such as Devario malabaricus (Giant Danio), Schistura loaches, or other hillstream specialists.
• Caution: They may annoy slower, flat-bodied tankmates (like Discus or Fancy Goldfish) by attempting to “rasp” at their mucus coats.

• The “Jump” Factor: Like all Garra species, they are expert climbers. They can use their suctorial discs to scale glass and damp cables. A tight fitting lid with no gaps is essential.
• Filtration: Oversized filtration is recommended to manage the high waste output associated with their high metabolism.

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