I wouldn't personally go nearly that big for a 75g. I know you want to upgrade eventually and planning ahead is great but a 1000+gph pump on a 75g is insane, imho...
I have used ViaAqua and Quiet One pumps. All good results except the Quiet One pumps are not so quiet when ran externally. I have to keep it loosely wrapped in a blanket or it makes noise. The ViaAqua I have only ran submerged internally but they are good too.
Don't just look at GPH and Purchase Price. Look at wattage as well, this is a major factor... A couple smaller pumps may equal a larger pumps performance but only use half the wattage. You'll obviously only need one pump for a 75g but I'd look at 300-500gph pumps, it's all you need and will save money on initial cost and monthly cost to run it. Even at 300gph the turnover is 4x per hour. Every 15 minutes the entire tank cycles in volume, any dead spots may need a powerhead unless you design a good spray bar. Then when you upgrade get another small pump and you're set again. Then combined they'll likely use less wattage as one giant pump and if one fails one still runs...
Also, I like slower flow for more media dwell time and so the fish don't feel like they're living at the bottom of Niagara Falls.
If you've ever seen a 500+gph pump run at no head height in a sink you know what I mean, they move a lot of water quickly.
Just my .02...
I have used ViaAqua and Quiet One pumps. All good results except the Quiet One pumps are not so quiet when ran externally. I have to keep it loosely wrapped in a blanket or it makes noise. The ViaAqua I have only ran submerged internally but they are good too.
Don't just look at GPH and Purchase Price. Look at wattage as well, this is a major factor... A couple smaller pumps may equal a larger pumps performance but only use half the wattage. You'll obviously only need one pump for a 75g but I'd look at 300-500gph pumps, it's all you need and will save money on initial cost and monthly cost to run it. Even at 300gph the turnover is 4x per hour. Every 15 minutes the entire tank cycles in volume, any dead spots may need a powerhead unless you design a good spray bar. Then when you upgrade get another small pump and you're set again. Then combined they'll likely use less wattage as one giant pump and if one fails one still runs...
Also, I like slower flow for more media dwell time and so the fish don't feel like they're living at the bottom of Niagara Falls.
If you've ever seen a 500+gph pump run at no head height in a sink you know what I mean, they move a lot of water quickly.
Just my .02...
