2 tunze nano stream 6025 and 2 6045 and my return of 1200 gph ending up around 38 x turnover.
and this tank is on its way to becoming an sps tank lol

90g Mixed reef (7 SPS colonies and 5 frags)

2x koralia nano @ 240 gph
2x koralia 3 @ 850 = 1700 gph
Reeflow Snapper return @ 2600 gph - plumming roughly 2100?

total = 4040

should be somewhere around 44x turnover

55 Gal Mixed Reef

Quiet One 4000 Retrurn =800 (3' head)
Koralia 3= 850
Koralia 2= 650
Koralia 1= 400
MJ 1200 = 147 (295 x 50%, on wavemaker)

total 2847 , approx 52X / hr

I have a 120g (48"x24"x24") SPS dominated reef, im running the following;

Mag 18 return (est 1250gph)
2- Koralia 4's
1- Koralia 3
2- Vortech mp40w's, set about 80% on lagoon mode

For an estimated 9500 gph or 80x turn over. I also have 2 aqua clear powerheads buried at the back of my rock work that im not counting as i dont recall the model #

70G mixed tank.
1 x Koralia 4 (1200gph)
1 x Koralia 3 (850gph)
1 x Koralia 2 (600gph)
1 x QO return pump (about 300gph after head loss)

Total 2950gph / 70g = 42x turnover. I've thought about more but whenever I add it, mushrooms start letting go throughout the tank and create a real mess.

Mixed reef (sps dominated) 98x turnover with maxijet mods, a K4 mod and return pump. May add a wavebox or vortech to add some much needed random and back and forth flow.

Not delusional at all...I have noticed the exact same thing many times. I bought a nice sized colony of a green acro a few months back. Decided I really like it and so I fragged it a few times to put in different spots in the tank (the tank has years to go before its grown in anyways, so fragging colonies is not a big deal). I have noticed that two of the pieces I put in very high flow have only encrusted while the piece I put in a very, very low flow area is growing like a weed, straight up. The one growing the fastest gets just random flow from different directions because its right in an area where flow from both sides of the tank meet. Says a lot about flow...less but more random has been very good for this acro. Same thing with the digis I have all over the tank. Ones in low flow grow much faster and higher while the ones in high flow grow thicker and diagonally almost.

180g LPS and softies.

2 Tunze 6100. 6340gph.
2 MaxiJet 1200. 590gph.
Mag 18 return. 766gph, estimated after head loss.
Total 7696gph ~ 43x turnover/h
...but, I recently decided to cut back so I put the Tunzes on timers. Six hours on, 6 off. And opposite each other. So...with at least one Tunze off all the time, flow is now...
4526gph ~ 25x/hour.

as you both have seen there is a lot more to flow than just the amount, you also have to achieve a masive water movment with out blasting with a slight up welling. I had to fiddle with mine for about 2 months to get the growth and shape I wanted and if you have sane forget it as now you are putting that flow in the top 1/2 of the tank so you are realy doubling it in that area.

even with a 144X turnover in my tank, you could put your had anywhere (aside from directly infront of the pumps) and only feel a gentle current anywhere in the tank.

Steve

Tunze 6100 (~3,000 gph) alternating with a modified Tunze 6055 (~1,800+ gph)
Eheim 1260 return (~250 gph after head loss etc).
Wavebox

So at most about 3,250 gph of "primary" flow at any one time.

120 gallon display = ~27 times turnover.

Mixed reef on a Gyre flow pattern.