What type of piping do you use for your tank?

I’ve mostly just used silicone tubing, that is a off-clear color to make sure I can see whenever I may need to clean the tubes out (and also to allow for me to bend them as needed in whatever direction).

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Pretty thick silicone tubing, since it’s easy to bend, see through if you get a clear-ish color, and allows you to not have to preplan too much on building a maze of PVC