When you remove half of your starter and replace with flour and water, is the removed dough a second culture? Like, could I feed it as well and have 2 starters?
The main reason you remove half of the starter before feeding is to cut down on the size of your starter and the amount you have to feed.
Yes, you can create a second starter with the removed half, but if your first batch is going strong
Learn how to feed and care for a traditional sourdough starter culture. Caring for a sourdough starter is quite easy. A starter simply needs to be ...
This is our Sourdough Starter and how we care for it and feed it.
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Our schedule in the van for feeding the sourdough starter! 
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"Hunger"
It doesn't matter what type of organism you are, or where you come from. Everyone, even the most basic life form of wild yeast, needs nourishment regularly. It's up to those of us who are able to provide that basic sustenance, be it in a physical, caloric sense...