Another yes here, for all the reasons posted above.
No real need for the cannister filter, really.. Long term it can do more harm than good.
you definately won't be disappointed replacing your 10g sump/fuge with a 30g.
When you do, we can help you out with dividing your tank!
Good luck!
Dylon,
for years Ive always known that in a marine tank, you don't want any "mechanical" filtration blocking anything from getting into the main tank.. However, I recently gave filter socks a try, and for now, I'll be sticking with them. imo, bacteria will still get through the sock, and, since the sock is placed in the 1st chamber of the sump (tank drain), the fuge still has plenty of organisms to make their way to the main tank.
Only drawback is that they have to be cleaned and changed every 3 days or so.
Then again, this is my opinion and not necessarily the ideal setup. All I know is that it helps keep my water crystal clear.