What requirements might make culturing parasitic zoomastigotes difficult in lab?

Culturing of parasitic zoomastigotes in the lab might be difficult due to their fastidious nutritional requirements, need for specific growth conditions (such as temperature, pH, and oxygen levels), and potential interactions with host cells or other microorganisms in a symbiotic relationship. Additionally, some zoomastigotes may have complex life cycles involving multiple hosts or stages that are challenging to replicate in a lab setting.