YoYo Loach (Botia almorhae)

YoYo loaches possess very small, embedded scales that make them functionally scaleless when it comes to medication absorption. This is the single most dangerous knowledge gap in their care. Standard copper-based ich treatments, malachite green, and many proprietary disease medications dosed at the bottle's recommended rate can poison or kill them.

Ich Treatment: For Ichthyophthirius multifiliis, the lowest-risk first option is raised temperature alone: increase to 86F (30C) for 10 to 14 days with strong aeration. If chemical treatment is necessary, Hikari Ich-X is the only commercial product dosed at the full label rate for scaleless fish. All copper-based ich medications must be dosed at half the recommended rate with extra aeration and removed activated carbon. Malachite green must also be halved.

Skinny Disease (Internal Parasites): Treat with levamisole hydrochloride at 2 mg/L for 24 hours with lights off, followed by a 70% water change and thorough substrate vacuuming. Repeat in 21 days. If flagellates such as Spironucleus are suspected, use metronidazole at standard in-tank dosage for 5 days, or soak pellets in metronidazole solution for 15 to 20 minutes before feeding. For tapeworms and flukes, praziquantel is safe at standard doses.

General Rule: Always remove activated carbon and UV sterilizers during treatment. Maintain maximum aeration. Quarantine treatment is always preferable to dosing the display tank. Salt tolerance is low; avoid concentrations above 3 ppt.

Skinny disease is the most common health crisis affecting YoYo loaches, particularly wild-caught specimens. It is caused by internal parasites, most commonly nematodes (roundworms) or flagellates such as Spironucleus (formerly Hexamita). The hallmark symptom is a fish that eats normally but loses weight progressively, developing a sunken belly, narrow body, and visible spine. White stringy feces may also be present.

Why loaches are especially vulnerable: Wild-caught YoYos frequently carry parasite loads from their natural habitat. Stress from transport, poor water quality, or inadequate diet weakens their immune system, allowing latent parasites to proliferate. Skinny disease often appears weeks or months after purchase, making quarantine critical.

Treatment Protocol:

1. Perform a thorough substrate vacuum and 50% water change before starting treatment.
2. Remove activated carbon and UV sterilizers from all filters.
3. Day 1 to 3: Treat with levamisole hydrochloride at 2 mg/L (or fenbendazole in food at 1% to 2% concentration). Lights off during treatment.
4. Day 4: 50% water change, add activated carbon for 12 hours, then another 50% water change.
5. Day 5 to 9: Treat with metronidazole at standard in-tank dosage to address flagellates.
6. Day 10: 50% water change, add activated carbon.
7. Day 14 to 16: Repeat levamisole treatment to catch parasites that hatched after the first round.
8. Maintain pristine water quality and feed high-quality protein-rich foods during recovery.

Prevention: Quarantine all new YoYo loaches for 4 weeks. Treat prophylactically with metronidazole or levamisole during quarantine before introducing them to the display tank.

YoYo loaches are generally peaceful toward other species but their high activity level, bottom-dwelling dominance, and occasional fin nipping make them incompatible with certain combinations.

Ideal tank mates include: Zebra danios, harlequin rasboras, cherry barbs, tiger barbs, larger tetras such as Buenos Aires and Columbian tetras, rainbowfish, gouramis (avoid long-finned varieties), angelfish (with caution), Corydoras catfish, bristlenose plecos, and other robust active fish. They can tolerate mildly aggressive tank mates better than most peaceful species. If kept as the only loach in the tank, they will team up socially with other active fish such as danios or barbs, though this is not a substitute for conspecifics.

Avoid the following: Betta fish (long fins are targets for nipping), fancy guppies and long-finned livebearers, discus (too sedate and sensitive), small shrimp such as cherry shrimp and Amano shrimp (will be eaten), small ornamental snails you wish to keep, very small or slow-moving fish that cannot compete for food, and other bottom-dwelling loach species that may clash territorially. Clown loaches are generally too gentle and large for YoYo boisterousness; many experienced keepers do not mix them. Kuhli loaches prefer much calmer water and are easily outcompeted by active YoYos.

YoYo loaches have not been reliably bred in standard home aquaria. While mature females regularly fill with spawn and display reproductive behavior, successful captive breeding is exceptionally rare and typically requires hormonal stimulation or accidental triggers in very large, mature systems.

The few documented successes have occurred in tanks of 75 gallons (284 liters) or larger with established colonies of 6 to 8 fish aged 2 years or more. The reported trigger is a simulated rainy season: lower temperature to 70F to 72F (21C to 22C), perform a large 50% water change with slightly cooler, soft water over 4 hours, and increase water flow significantly. They are egg-scatterers over fine-leaf plants. Females may release 1,000 to 3,000 eggs. Parents must be removed immediately after spawning as they will consume the eggs. Eggs hatch in 24 to 36 hours at 75F (24C). Fry require green water for the first 5 days, then newly hatched brine shrimp.

For the home aquarist: Do not purchase YoYo loaches with the intention of breeding them. Focus instead on providing excellent long-term care. If spawning occurs accidentally in a mature community tank, remove the eggs or parents promptly and be prepared for extremely difficult fry rearing. Commercial breeding occurs primarily in large outdoor ponds in Southeast Asia, not in aquarium conditions.