I had to say controller, its mainly made things tidier and simpler to run and its potential uses are amazing.
My calcium reactor has proven itself to be an essential and very necessary piece of equipment. I couldn't keep my calcium and alk levels right before it, despite regular testing and dosing and testing and dosing and testing and dosing..... One or the other or both were usually way off.
Only other item I have is the Phosban reactor, and its hardly worthy of "investment" status compared to the rest of the gear. More of a trinket, but a handy one at that.
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I retired and got a fixed income but it's broke.
Ed
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50 gallon FOWLR, 10 gallon sump.
130 gallon reef, 20 gallon sump, 10 gallon refugium.
10 gallon quarantine.
60 gallon winter tank for pond fish.
300 gallon pond with waterfall.
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