Do you dose in hydroguard during the flush schedule or would this be considered a chemical? I would normally add some after each drain/fill.
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Hydroguard is beneficial bacteria, not a chemical. You can still dose in flush if you need to 
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I flush without only because its the end of the grow and I like to get really clean, crisp buds.
Ive never run into a problem of any bacteria growth during this period, I think you get a higher chance of bacteria issues when using nutrients.
Maybe try it both ways with the same strain to develop a sense of what you prefer! 
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I use Hydroguard and AN Flawless Finish for flush except the very last week I think. I can’t find my dosing sheet as my grow room is being moved around right now. Then at the very end, I turn the lights off 48 hours for some reason I read about. 
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