refugium or overflow ideas

[mark]

Refugium and overflow two different things. Are you thinking partitioning off part of your display as a refugium, then overflowing into a sump?

[tgoeujon]

no i basically want to run a smaller tank out of the same system so maybe overflow is the right word

[mark]

Lots of different types of overflows; the tradional overflow box with bottom of tank drilled, an external overflow, HOB, coast to coast etc.

Try searching for some of these to start some ideas.