Flow can you have too much ? Some say no my experience is yes !
If you have any large LPS it's very difficult to keep them happy if you want SPS and the strong flow they require. I have a Euphyllia ancora that I've had for at least 3 years that used to extend to the size of two grapefruits and when I had my flow at about 30x turnover pieces of flesh were actually ripping right from the skeleton. Also most of my other LPS would not open fully. I have a cube so the situation is a bit different for me since my tank is only 30"x30", if it was longer then the problem would be minimized.
On the other hand when I reduced the flow to about 20x turnover cyano began to appear on the substrate so flow placement is key. The placement of LR is also very important so you can have evenflow throughout the tank.
Can you not have enough ? Yes and I think this is the more common problem. IMO if your keeping a mixed tank 15to 20x turnover should be what your shooting for.
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I tried a little sand and with all my flow, I had my sand in the back of the reef within a week or so? So how do all you people with sand in your tank, keep it?
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Once the sand becomes colonized by bacteria this problem should go away but it will take some time.
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I think I need to find some different nozzles for directing the flow than what we have
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Gina I don't remember but did you use Loc-Line ?