Polka-Dot Loach

Cobitoidea sp.

Polka-Dot Loach (Cobitoidea sp.) — Intermediate care, Peaceful, under Loach. Minimum tank in the app: 42 US gal min; aim for 72–82°F and pH 6–7.8. The Polka-Dot Loach is a captivating addition for those who appreciate lively bottom-dwellers and are willing to manage their semi-aggressive temperament.

Polka-Dot Loach (Cobitoidea sp.) in a planted freshwater aquarium
Care levelIntermediate
TemperamentPeaceful
Min tank size42 US gal min
pH range6–7.8
Temperature72–82°F
Max size5.9 in (15.0 cm)
Captive lifespan8–16 years
SchoolingNo

Captive lifespan reflects typical experience in a home aquarium, not maximum recorded age; genetics, sourcing, and care vary.

Natural distribution

Asia

  • East & Southeast Asia

Regional colours match the stocking calculator’s origin map.

Polka-Dot Loach Tank Setup

Create a balanced habitat with plenty of hiding spots using rocks, driftwood, and plants to encourage natural behavior. A soft substrate is essential for their foraging habits, while moderate flow can stimulate activity. Lighting should be gentle, allowing them to feel secure without excessive illumination.

What Do Polka-Dot Loachs Eat?

Feeding should be timed to accommodate their bottom-dwelling nature, as they can be outcompeted by faster feeders. Offering a varied diet that includes sinking pellets, frozen foods, and occasional plant matter will enhance their health and vibrancy.

Polka-Dot Loach Tank Mates

Ideal companions for Polka-Dot Loaches include mid-size, similarly temperamental fish that occupy different swim zones, such as barbs or tetras. Avoid overly aggressive species or those that occupy the same bottom space, as this can lead to conflicts. Intraspecies, they thrive better in varied groups, as solitary individuals may become stressed or aggressive due to lack of social interaction.

Are Polka-Dot Loachs Good for Beginners?

We rate this as intermediate. Budget time for testing, maintenance, and watching behaviour if the water looks fine but the fish do not. Aquarists often underestimate the importance of tank size and structure, leading to stress from overcrowding or lack of hiding spots. not recognizing their semi-aggressive tendencies can result in poor compatibility choices, causing conflict and injuries among tank mates.

Building a community? Run the full list through the stocking calculator before you add anything else.

Log tests and reminders in App-aquatic—free, same data you see here.