I hope two won't be too much for a 75, I'm going to use two on a 55 and two more on either another 55 or a 90. I know it will be fine on a 90 - the flow is gentle so I think it's good for a 55 and a 75 too. I will take some pics tonight & post them tomorrow after work (11pm). I'll try to add a video so you can see how much they move the plants...
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