I like it thanks guys- I have 3 bulk reef supply 1.1/ml dosers and a apex so anything can happen

- great point on watching my data then adjusting from that- I am putting all this in this weekend so I will let the post know what's up soon
i have the same set up as you do but magnesium is not used too much when my gallon jug is empty i test it and add whats needed usually 30-40ml.
As for dosing alk i dose 1 hour after lights out to maintain ph 30 min. then skip an hour then dose I dont want to keep cycling the triac outlets and wear them out and outlet 4 and 8 will wear out faster.
ALKALINITY , the then off is just there because i was dosing every 10 min and it'll be easier to just change times and on or off also worried about triac sticking although it has been ok
Fallback OFF
Set OFF
If Time 22:00 to 22:30 Then ON
If Time 23:00 to 23:20 Then OFF
If Time 00:00 to 00:15 Then OFF
If Time 01:00 to 01:30 Then ON
If Time 02:00 to 02:20 Then OFF
If Time 03:00 to 03:15 Then OFF
If Time 04:00 to 04:25 Then ON
If Time 06:00 to 06:30 Then ON
If pH > 08.25 Then OFF
CALCIUM the calcium is in am due to don't want to dose both at the same time
Fallback OFF
Set OFF
If pH > 08.25 Then OFF
If Time 09:00 to 09:30 Then ON
If Time 10:00 to 10:30 Then ON
If Time 12:00 to 12:30 Then ON
If Time 14:00 to 14:05 Then ON