6025 or 6045

75 is approaching the size range were a full size stream like 6101 makes the most sense but you could use 2-3 6045 or 2 6055.
 
Agreed. I used the 6060 streams in my 75 and it gave me a very good amount of flow. The nano streams are more for smaller tanks. I use two 6045s in my 37. What tpye of tank are you going for?
 
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