I kept lights 100% for the first 2-3 weeks and had a 6 hours photo period, since I use the light controller I am ramping it up to 100 over 2 hours, 100% for 4 hours and then ramp down for another 2 hours to 10% and then from 10% to 0% over two hours for night light. Might change that back to my original plan and see.
Interesting Paulo, begs the question that if it was working was it worth changing it? On balance have found far less problems without ramp up/down periods. If it’s a fifteen minute ramp up and down then could support it as it seems to have had no negative affect on plants. Certain fish that startle easily have really appreciated it too and obviously we have to consider them as well.
Can’t really isolate lighting without mentioning Co2 though, they’re in relationship...
Both tanks in the house now just have lights that come on/off, their lighting period is six hours and have found Co2 periods of one hour longer (e.g Co2 on 10am to 5pm and lighting period 2pm to 8pm) to work out well in general. That’s 7 hours of Co2 to 6 hours of light offset.
The order of organisation that Co2 input is decided here is:
- amount of time of input (it needs to ramp up ppm to desired level before lights on, with enough above the optimum at lights on to deal with an initial dip when plants begin uptake)
- a reasonable off time is needed (Co2 off with 3 more hours of light without Co2 is no problem here as the needs of the plants for carbon are met with the consistency of the first 3 hours of input). This may vary from tank to tank though and requires a bit of play - look at water clarity. Clear water, well oxygenated everything
- the photoperiod being capped at six hours with a commitment to that photoperiod (changing photoperiod length relates to all other points of adjustment with Co2) as changing photoperiod relates to everything else
- working with a consistent working pressure on a dual stage regulator which leaves...
- the final factor here in this version of Co2 setup being the needle valve
You’re then after a refinement process using a single knob to fine tune your Co2 in very small increments (1/8 of a turn at a time) to find the sweet spot that week.
With all of the above being held consistent you’re simply tracking your plants needs with 1/8 of a turn between trimming when required - simple! The point is even if you don’t fine tune with the needle valve you’re probably only 10% out from spot on with this method.
Strongly believe a whole host of problems seen on the forum are because people change say, lighting period, Co2 period length and (insert what you want) as well. It’s undisciplined is the point.
Get that the scapes I run won’t win any awards and certainly not any authority here, it’s just relaying experiences. But the water is gin bloody clear and the tanks look like jacuzzis with all the pearling when they’re in the photo period. I believe that’s owed to holding as many things as consistent as possible and not letting the temptation of changing too many things at once take control.
Being as methodical as possible pays off big time sums it all up I guess.