Inside aquarium cabinet setup

Quick glance into my 324L cabinet system installation and fertilizers I'm using.
aquascaptor
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[@lukebfox]

Real classy set up

[@vageliekaratzas3488]

interested to know more about the plumbing setup between the fx4 and the reactor. is that 1" ID tubing, pvc piping and 90° elbows being used? Seems there's very little info online around plumbing for the fx4/6