I have the same tank. Absolutely LOVE the dimensions and I am sure you will love it too! If you remove the overflows as you mention and plumb simple PVC pipes to the surface of your tank you will have what amounts to a constant flushing toilet sound from your tank all day long. The overflows in the 120 are built to contain your Durso standpipes and your return lines. You need the Durso's if you expect to live in the same room as this tank. You could remove the overflows and just install the standpipes i suppose, but the overflows are a nice feature if you ask me. They hide your plumbing and still leave plenty of room for happy Discus. Congratulations on the DEAL of the CENTURY and GOOD LUCK!!!