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@SuncrestReef has a series of Apex Tutorials. I think most of the links can be found in this post: https://www.reef2reef.com/threads/apex-newbi.669000/#post-6783825
You can do so much I'm not sure what to start with suggestions but heaters would be one of the first things I'd connect. If your heaters have their own thermostat then Apex can give you an additional layer of backup/redundancy. Beyond that just about everything can be controlled or at least monitored in some way or another so it probably becomes more about prioritizing how many outlets you have left available.
Thanks for that link it’s actually very useful, and I hadn’t seen it before.Thanks for linking my tutorial articles!
Before jumping into the programming tutorials, I highly recommend you carefully review this list of best practices for a new Apex setup: https://forum.neptunesystems.com/showthread.php?14598-New-APEX-Users-Read-This-Thread!