Beneficial bacteria assistance

[Lazarus13]

I'm running a 12 gallon top-fed dwc set up. I have 2 seedlings in it right now that are just getting ready to enter the first week of veg so I'm not using any nutrients yet. I am using beneficial bacteria and humic acid though to take a pre-emptive step against pythium and the other icks that love these systems. My res temps stay between 65°(lights off) and ~72°(lights on) with cfls and i just got some leds so they should stay around that or even be a little lower.
My question is how often should i add the benes and humic acid? Is it once a res change? Every top off? The bottles just say "add x amount of product to x amount of water" but mention no frequency. Thanks
Stay green...

 

[Papageno]

I responded to your other post int he FAQ.

Beneficial bacteria assistance

Now that I am subd here if it isn't clear just repost here and I will do better.