My 155 mixed reef which the only flow is from the two return pumps - Eheim 1260 submerged & external Iwaki WMD 40RLTdoes not have any algea problems with the exception of some green hair algea that grows inside the top edge of the overflows.
Now on the opposite end my 120 fowlr which has a Eheim 1262 & 4 MJ1200 on a RedSea Wavemaker is collecting red slime on the rear glass, pumps, and I believe on the rocks as well! I am attributing the slime bacterial outbreak to the fact that I was recommended to use "CopperSafe" for a Ich outbreak a couple of months ago by a trusted lfs manager who insisted, and still does that it was/is safe for the biological filtration.
for cyano outbreaks. All frozen foods are rinsed several times through a brine shrimp net before being soaked in vitamins, and such.
Plenty of flow in this tank! Was doing weekly w/c until three weeks ago - did one today!
Anyway, what I am saying is that there are many different reasons. And the fact that I do not believe tons of flow is the answer to every ill that affects our tanks. I've come to this conclusion not by reading a ton of articles, but by experience with, and without power heads over the past 7 years.
Disclaimer: I do not keep Hard to Keep SPS corals!! The few SPS I do have in my system are the low flow types!!! This is my choice since I do not like the look of PH in my displays!
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