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I had an external that wasnt plumbed in like the pix above and it was a pain as I lost the siphon when cleaning. The reef savvy has tge advantage of not having a "box" in the middle of your display
What other option you talking about?overrlow box on the back of the tank Is where your pipes go. You don't have any room there for anythingI was to start again today I would do a ghost overflow. Just my opinion. I'd like to have that overflow area back for other options.
Not sure I understand your question. All overflow boxes that I am aware of have the internal surface skimmer box. For those that do not, don't use them, the surface skimming properties are very much needed. Some have the external box, some don't. It is better to not use the external boxes since almost all of the systems that come with both do not account for the proper tank water level and you end up with a low level in the DT. Drilling and using an internal only box allows you to set the water level where you want. You then attach plumbing directly to the bulkhead on the outside of the tank.