I recently added one of my new WP40's to my 6' 100g tank, in the same spot where I had a Coralife DC5800 (2900gph) running. It seems to make pretty similar flow, and about the same sound (when ramping up and down), pretty quiet actually.
I moved the Coralife to the back, so have 2 high flow pumps now on that side of the tank. My SPS on that side should be pretty happy. On the other side, also want to add a WP40 and move the other DC5800 to the back. But will have to trim/reposition some LPS (frogspawn and bubble corals) first, so they don't get blasted with any direct flow.
The light sensor on the WP40 controller works well, and powers down at night, even with my moon light, just like my Coralife pumps. So that is good. I like the feed button on the WP40, as it shuts the pump right off for 10 min. The feed button on the Coralife shuts the pumps down to low power (same as night) for 30 min, which is really too long.
The controller on the DC5800 has more variance on the time settings for the turbulent flow than the WP40. But the combo of the two different types of pumps works out well.
I paid $215 USD for the Coralife DC5800 (2 pumps with controller) last year (comes with lifetime warranty), but with the group buy, the WP40s are still cheaper. Anyway, the WP40 looks like a good pump, and will see how they are in the long run.
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