Common Name
San Marcos Redtail Splitfin
Origin and Habitat
Endemic to springs, ponds, small reservoirs, and seasonal streams in the Etzatlán region of Jalisco, Mexico, with a focus on the endorheic Laguna de Magdalena basin and nearby upper Río Ameca subdrainages. Sites range from clear spring pools with aquatic plants to shallow turbid ponds over mud and gravel. Several historical localities have been lost to groundwater extraction, spring diversion, and pollution. Remaining populations are fragmented.
Temperature and Water Conditions
Aim for 20 to 24 Celsius, which is 68 to 75 Fahrenheit, with strong aeration and steady flow. Wild waters in the region are generally neutral to slightly alkaline with pH around 7 to 8. We do not recommend chasing
FAQ
What is the ideal water temperature for San Marcos Redtail Splitfin?
The ideal water temperature is between 20 and 24 Celsius (68 to 75 Fahrenheit).
What type of water conditions do these fish prefer?
They prefer neutral to slightly alkaline water with a pH around 7 to 8, and require strong aeration and steady water flow.
Where are San Marcos Redtail Splitfin naturally found?
They are endemic to the Etzatlán region of Jalisco, Mexico, particularly in springs, ponds, small reservoirs, and seasonal streams within the Laguna de Magdalena basin and upper Río Ameca subdrainages.
Joanne Marshall –
The fish are active and colorful. I’ve maintained them in a well-aerated tank with stable temperature and neutral pH. They seem to thrive in a flowing environment. A bit shy at first, but they settle in after a few weeks.
Evan Murray –
They do well in a tank with gentle current and clean water. I keep them with other peaceful species. The water needs to be stable and well-filtered to avoid stress.
Vanessa Ince –
Great addition to a tropical community tank. They stay active and show natural behaviors. I monitor water parameters closely and maintain a consistent temperature.