A float switch is just what the name implies. It is a switch used to control an electrical device like a pump, and is operated by rising and/or falling
Not a flying fox. A flying fox has a gold stripe on the top edge of the black stripe. That is a true Siamese Algae Eater there.
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So I'm going to attempt to do this using a sump tank :-/
I really wanted to avoid using a sump but meh. I'll post an update with a DIY guide