Dave,
As long as you're spending time during TTM to observe the fish I think you'll be fine waiting for your observation period. I've always done TTM + Prazi followed my observation. There will be plenty of light to observe behavior and physiological symptoms during TTM.
As long as you're spending time during TTM to observe the fish I think you'll be fine waiting for your observation period. I've always done TTM + Prazi followed my observation. There will be plenty of light to observe behavior and physiological symptoms during TTM.