cpr and aquamedic make hang on fuges I believe.
Ecosystem has them too, and thats the brand I would reccomend. I have one. Their a good deal. It comes with an overflow box, bioballs "miracle mud"(just the substrate they use) return pump and inflow kit. I got mine for 275$ shiped.
As for them on a large tank, I would think they would need to be rather large and have a higher flow rate. Ecosystem hangon models come in 40 gallon and 60 gallon sizes.