Suggestions on Over flows/ drilling for 29g Reef

[mark]

Seem some posts here about reasonably priced diamond hole saws at e-bay.

Drilling with a Dremel isn't that bad either. I've done a couple of holes for 1" bulkheads on a 20 and 33g so would imagine similiar thickness to your 29g. Each hole took ~15-20 minutes with cheap diamond grinding bits from Princess Auto.