That hammerhead may be a bit more flow than you think
You're going to need to upgrade your drains from the tank for sure. I bought a Hammerhead for my 375, but ultimately backed down to a Dart. On a 540, you're going to get a TON of flow from the HH. However, they are among the best pumps available. You can always change the impeller to a Baracuda, and that will back you down a bit. If you feel like you need to, premiumaquatics.com was very helpful with my order.
Overflows are noisy depending on how you do the plumbing. Durso standpipes are noisy. PERIOD. A Herbie is a much better way, and MUCH more quiet. A Beananimal even better, but requires 3 holes. There are several examples if you do a quick search. I've posted several links in the past.
Overflows are noisy depending on how you do the plumbing. Durso standpipes are noisy. PERIOD. A Herbie is a much better way, and MUCH more quiet. A Beananimal even better, but requires 3 holes. There are several examples if you do a quick search. I've posted several links in the past.

