Are there any filtration experts who could advise me on setting up a freshwater sump system from scratch....? Want to use the "Herbie" system but not sure on the size of holes I need to get drilled (bottom), width of pipe/bulkheads etc and size of return pump....!!! Total sump noob....! Tank is approx 4 x 2 x 2 around 350 litres....ish. Thanks.