Nice looking pump! None of the online pictures I've seen of the Reeflo gold pumps show the pumps with a gold color. After seeing yours, I had to check out one of my Barracuda Gold pumps which have been in its box for months now....same color as yours!
I had thought about going with Hammerhead Gold, but the Gold has a little less "umph" than the regular Hammerhead. It's a little weird, because the Barracuda Gold is more powerful than it's predecessor. The Hammerhead pump on our 300 gallon tank has performed flawlessly for over five years. I bought a spare Hammerhead in case of a failure...haven't even opened the box.
Our plumbing to the tank is necked down to 1" pipes at the tank (from the 1.5" from the Hammerhead port) We have tremendous current in the tank from the Hammerhead....our fish love it!
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Don't remember about priming the Hammerhead pump...it's been too long since we set it up....we unplug the pump during water changes and then plug it back in...it's just a beast of a pump. I'm sure you'll be very pleased with your Hammerhead Gold.