Corys like plecos They can tolerate ph levels ranging from 6.0 - 8.0 6.8 – 7.4 is ideal. Their temperature range is from 68 – 80°F, 70 - 75°F is ideal. Fortunately they can tolerate the summer heat in water temperatures in the mid 80s, but a heater is encourage to be use during the winter. They are freshwater fish but the use of some aquarium salt is recommended, preferable one teaspoon of aquarium for every five net U.S gallons.