i am getting a 7ft long 2ft high 3ft wide tank built as iam after moving house iam not new to the hobby iam keeping fish 7 years marines the last 2 i was wondering if anyone could suggest what size sump will i need for this size tank.My last tank was a 400 liter jewel with a hang on skimmer.i want to employ a sump this time and i want to use metal haldes any ideas? :roll: