How can I tell what sex my algae eater is?

Determining the sex of an algae eater can be challenging, as many species, like the common Plecostomus, exhibit minimal sexual dimorphism. Generally, males may have more pronounced dorsal fins and a leaner body, while females tend to have rounder bodies, especially when carrying eggs. Observing behavior during breeding season can also help; males often display more territorial behavior and engage in courtship rituals. However, for definitive identification, some species may require close examination or expert knowledge.