You can certainly save money with DIY, but for some things it is just not worth it to me. That's why I have Radions and an Apex. Maybe not the very best in class, but sure beats anything I could build myself. I also wouldn't build my own skimmer.
But when it comes to tanks, sumps, overflows, cabinets, plumbing, electrics, ATO's, reactors, filters, etc, there are lots of opportunity to save money as well as optimize performance and tailor to your preferences.
I use the same philosophy with my airplanes. I build them for performance and personal preference, and save a lot of money. However, I still buy the best engine and propeller for it. I won't build those components.
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