I have mine on fluval evo 13.5, i have it places on the opposite site of the return in the centre close to the water line. I run mine at random for the most of the 24hrs, when the lights are off i run it at lower power and when the light is on i run it on higher power, both variances i have them maxed out on high so i get alot of randomness, but honestly i just got it a couple of weeks ago and still am trying to figure out the "perfect" flow for my tank with the pump. Also i run 3 times a day pulse mode, one when the lights are off with strong power but only on for 0.25 secs and off for 4 secs, i run 1 pulse mode in the morning when lights are off again at lower power than the 2 that i run with the same timing but more power when the lights are on. with pulse mode im trying to get sort of the standing wave going a tiny bit for good transport of necessary molecules. Im still fiddling with the pump to get the flow right, we'll see what happens!! If u need anything let me know and ill help as much as i can!!