I'm finally done with building my 40 breeder tank!!!! Last thing is return Pump. I will go with Jebao DC or DCT newer version. Numbers says that 3000 should be enough for 40 breeder mixed reef with 20 gal. Sump. But Im thinking about buying 6000. Just in case… I have a WP40 for over a year and I swear i feel like they slowed down little. So I think at some point 3000 ( full power little less then 800 gal/hour but that is without head loss) might be not enough and having 6000 I can always dialed it down. what do you guys think? Is 6000 overkill? Thanks for all advice.