How seemless or foldless you need is probably up to you, I wasn't worried about folds, but probably could have pulled it tight if I did (especially when inside on an even floor, outside the ground was pretty lumpy anyway).
When you put the pool together, if you use another person to help pull it tight, I'm sure it will work. I did it myself and just kind of slapped it together.
As far as a pump goes, I used a pond type in a cage (Laguna) and sent the water thru a DIY bio-fractionator which worked well removing free floating algae and proteins.
as you can see it produces plenty of foam waste, that I let fall into a bucket, or on the ground, even though I fed the Tilapia a low protein diet.When overwintering koi in the cold basement, I didn't feed at all for the entire winter as the water temp remained below 50'F.