You are on the right track. I would avoid the splitters if finances permit, but that's a minor detail. The return pump on battery is optional, but your wattage is low enough that it should be ok. As for the return pump, make sure that you still plan for an eventual failure (even if it's just for maintenance).
Automation is great and I run my system off a pair of apex controllers. Just don't lose sight of simplicity.
Brad
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