I would just keep the hob fuge and use an overflow box then when you hook up the sump just hang the ac 70 on ur fuge if you want. I would also recomend a hob skimmer or one w/ a small footprint such as an aqua c urchin or euro reef nano... Both of which I believe are currently for sale on here. As for hob skimmer a aqua c remora nano would work well. The advantage to a hob skimmer would bt to maximize the space in the 10 for a good return pump, intake w/ filter sock, and then some other mech/chem filtration, maybe even a fuge and get rid of the ac 70 just my opinion.