What are your parameters i.e.(Alk, Ca, and Mg). My Red Trumpet always had it's tentacles come out about 3-4 hours after lights out, meaning I never saw them because my lights go out at 10pm, so I am well sleep when they decide to come. I stayed up one night late and saw them fully extended. IME, I have never saw mines come out with lights on, feeding or not. it's still growing.