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Flood and drain reservoir maintenance?

Hi all,
So i have 2 flood&drain tables for clones and teens and a 25 gallon res for their nutrients.
I have come to ask the community how you guys maintain the water for a few days.
What can be added in the res to keep it from growing algae and cyanobacteria?
I tried h2o2 - it keeps it clean but then i get a boom of cyanobacteria growing in it.
Also tried adding hydroguard 2ml per gallon but the next day my water smells like crap and also cyanobacteria is growing in the res.
So would...

Flood and drain reservoir maintenance?


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