If an external pump leaks it's going to go all over the floor. If the internal pump leaks it's all contained in the sump.
The other reason for wanting an internal pump is space in the cabinet. I will be able to fit a caclium reactor inside as well. On my current 29 gal tank, all the equipment is showing and I'm tired of that look. On the 90 gal I want all the lower equipment hidden.
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