Apex controller

[kacairns]

Fallback OFF
Set OFF
If 180Tmp < RT+0.5 Then ON
If 180Tmp > RT+1.0 Then OFF
Defer 000:05 Then ON
Defer 000:05 Then OFF
If FeedA 000 Then OFF

Thats what I use for my heaters, using the seasonal tables, this is set for freshwater tank, not salt but I'm sure the temperature might be around the same anyways. The defer statements make the program wait instead of instantly turning the heaters on/off to verify that the temperature actually requires something to be done instead of possibly turning on/off/on/off a bunch of times in a row if temperature is real close to the set points.

If the temperature is 1 degree F over the Seasonable table, turn OFF
If the temperature is 0.5 degree F over the Seasonable table, turn ON

Yes I only let my tank change in the range of .5 degrees before turning on/off

In my 37g tank this turns the heater on for 20 minutes every 3-4 hours