I am replacing a few pumps in my 75 gal and need some advice. I need a external pump that puts out about 800 gal at a 4-6 foot head. Currently I am using a rio 3100.(I would like a little more flow then this pump). I was thinking of getting a Mag 950 or a 1200 but I think the 1200 will be to strong.(Can a ball value slow it that much?) The main constraint that I have is the inlet has to be 3/4 because the bulkhead fitting on my wet dry is 3/4. Any opinions are welcome. Thanks all. Hopefully I will be replacing my rio soon