I'm situated about 2.5hrs south of the Gold Coast & will probably look at getting my tanks from around there somewhere. If I go 2 foot cubes & central filtration, where's the best place to order them from? What size bulkheads would you recommend, 25mm? That's going to require a 34mm hole & the nearest glass hole saw I found was 35mm if I drill myself. For those that have drilled themselves, how many mm in from the side & from the top of the tank to the Centre of the bulkhead hole.