cr500_af;648938 wrote: Not too far from true! Sure, you can go too big if you try, but as an example I've got two 40s in my 90g tank. They are turned pretty far down (the max they run at any point in the day is 50%), but I'm able to take advantage of the sync/anti-sync to get more random flow.
"Night" mode is 20%, morning/evening is lagoon @ 40% and day is reef crest @ 50%.
Now, I wouldn't advocate buying two in this case (I bought them for the 210 and decided to use them while it's going together)... one would be plenty.