A red tide is caused by an increase in the population of toxic algae. ... the present-day bloom season, which is typically between July and October, but the bloom season.Blooms are commonly called red tides, but scientists prefer the term "harmful algal blooms" (or HABs). The term red tide erroneously includes many blooms that discolor the water but cause no harm, and also excludes blooms of highly toxic cells that cause problems at low cell concentrations..
red sea contains a hypotheses algae known as trichodesmium erythraeum which is a reddish in colour and turns the normal blue green sea water into red colur
red tides are caused due to increase in toxic red dinoflagellates i.e protista and comes under division pyrophyta.
The Red Sea is a seawater inlet of the Indian Ocean, lying between Africa and Asia.