No worries, Lou! The slow down in fermentation on days 4,5,6 is perfectly normal. New bacteria are starting to form and it changes the behavior of the starter. Keep up with the feeding and by day 6, 7 most starters show more growth again. It will be more moderate than when you first started, but it's really what you're shooting for. This blog post may be helpful as well: Sourdough Starter Troubleshooting 
 

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