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Hi-Fin Swordtail
Xiphophorus hellerii
Animalia›Chordata›Actinopterygii
Variety of Swordtail · hi-fin
📍 Central America
The Hi-Fin Swordtail is a fin-type variant with a dramatically extended dorsal fin in addition to the male's characteristic tail sword. Care is the same as standard swordtails; keep with peaceful tankmates to protect the fins.
Care Guide
Diet
Hi-Fin Swordtails are omnivores that thrive on high-quality flake foods and small pellets as their staple diet. Supplement 2-3 times weekly with frozen foods such as brine shrimp, daphnia, or bloodworms to enhance coloration and fin development. Include vegetable matter like blanched spinach or algae-based foods occasionally to support digestive health.
Behavior
Hi-Fin Swordtails are active, peaceful swimmers that spend most of their time in the middle water column. Males may display territorial behavior toward each other, so keep only one male per tank or provide ample space and visual barriers. They are livebearers that readily reproduce in established tanks with adequate vegetation.
Breeding
Breeding occurs readily in captivity without special conditioning; females produce live fry every 4-6 weeks. Provide dense plants like Java Moss or Water Sprite as fry refuges, as adults will consume their own young. Separate fry into a nursery tank for best survival rates, though some will survive in heavily planted main tanks.
Tank Mates
Similar size, peaceful temperament, and compatible water parameters make them ideal companions
Small, non-aggressive schooling fish that won't compete for space or resources
Peaceful algae eater that stays small and won't harass the Hi-Fin Swordtail's extended fins
Schooling fish with peaceful nature; avoid fin-nippers that might damage the extended dorsal fin
Non-aggressive invertebrate that helps with algae control and won't disturb the swordtail
Common Diseases
Fin Rot
Frayed, discolored, or deteriorating fin edges; extended dorsal fin particularly vulnerable
Perform 25% water changes every 2-3 days, maintain pristine water quality, and treat with antibacterial medication if severe; isolate if possible
Ich (White Spot Disease)
Small white spots on body and fins, rapid breathing, flashing against objects
Gradually raise water temperature to 28-30°C over 24 hours, maintain for 7-10 days, and use ich-specific medication; increase aeration
Velvet Disease
Fine golden or rust-colored dust on body, clamped fins, lethargy, difficulty breathing
Raise temperature to 28-30°C, reduce lighting, and treat with copper-based medication or salt baths; isolate affected fish
Dropsy
Bloated abdomen, pinecone-like scale appearance, lethargy, loss of appetite
Isolate immediately, perform frequent water changes, feed high-quality foods, and treat with antibiotics; prognosis is often poor
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