Just doing a quick scan through the forum for unanswered threads, and saw your comment, which includes a bit of a misspelling, which I read as
"I am an invertebrate label reader"
My older son does "invertebrate animal husbandry" (ie, he feeds and plays* with the nautiluses and octopuses) at the Tennessee Aquarium, so your post got the "Huh??, better read that again" reaction.
But to your question: Yes, remaining algae can definitely cause high chlorine demand.
PoolDoc
* The official 'PC' term is "enriches", not "plays with". :rolleyes: