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[geologeek]

yes that is correct!
the water is pumped up to it and gravity fed back. i was just wondering if the gravity feed goes to a refugium would i then be able to add a top up unit?

in most of your systems you have a sump below tank which is gravity fed and a system pump to push it back up to the tank.

the way i see it (although a bit cack handed) is that i have an above tank sump that i want to gravity feed back to a refugium (just below water level of main tank) which will then be pump fed back to the tank.... with me? (confusing myself somewhat)

i have a two foot wide window ledge (150 year old house) behind the tank which the bin is sat on.

obviously the water level will always be constant in the bin as it is pump fed, but the way i see it if i put a refugium next to it that is gravity fed from the bin and pumped back to the tank it will then be similar to other peoples undertank sumps so i can put a top off unit of some sort on that.......is this correct???

or am i just frying your brains as well as mine!!!