I prefer Pan World pumps, they are pressure rated pumps and very reliable.
The return pump from the sump should be adequate size to turn over your display tank volume 2 to 5 times per hour, but no more than that. Make sure your overflow will allow the same turnover volume.
The number of pumps and size depends on the setup you have planned. For your sumps, use in dwelling propeller pumps for agitation, one for each reservoir. Jebao WP 40 are cheap and move a lot of water, good for sump agitation
Without closed loops on a tank that size my guess is you will need more flow than the two surge tanks will provide. There are some rather large propeller pumps that Tunze and others make that would suffice. I run closed loops with Eductors with large 3 HP 220v Iwaki pumps, controlled with VFD's, all pipes hidden in the rock work, maintenance free, provides so much flow I have to run at 50% power, very cost efficient since the power usage runs up and down with VFD's
The return pump from the sump should be adequate size to turn over your display tank volume 2 to 5 times per hour, but no more than that. Make sure your overflow will allow the same turnover volume.
The number of pumps and size depends on the setup you have planned. For your sumps, use in dwelling propeller pumps for agitation, one for each reservoir. Jebao WP 40 are cheap and move a lot of water, good for sump agitation
Without closed loops on a tank that size my guess is you will need more flow than the two surge tanks will provide. There are some rather large propeller pumps that Tunze and others make that would suffice. I run closed loops with Eductors with large 3 HP 220v Iwaki pumps, controlled with VFD's, all pipes hidden in the rock work, maintenance free, provides so much flow I have to run at 50% power, very cost efficient since the power usage runs up and down with VFD's