I don't use hydroguard. I use compost tea, all I've ever used.
Makes it much more resilient to ph/temp/ppm swings, coats your roots to prevent drought and rot, makes nutrient absorption much easier etc.
Keep your res temps high 60s, make sure there are no light leaks (that will usually just give you algae which isn't harmful, but a pain in the ass just the same), swap and sterilize your bucket if you get any bad smells immediately and peroxide rinse the roots and/or cut any rot off if it happens, keep your grow area sterile as you can so you don't bring in spores... Thats about all you can do really.