Ok I e/m synergy. asking for specific info on what the template means. There is a sticker on the template with arrows that states "top of tank" I asked did this mean the very top of the tank? seems the template would be bound up over the 1st inside lip. Their response was " where ever You want the over flow to be " sorry but that's a pretty vague answer." Top of tank" does not mean "where ever I want it." Or Am I mistaken? sorry just disappointed with the run around response.