Those are 40B tanks correct? If so, just go with the 2" thick Poret, easier to handle, cheaper to buy and easier to remove when wet.
I don't run sumps but DO use Poret as HMF filters in my fish room tanks and also in my large Eheim filters.
Definitely contact Stephan at swiss tropicals for his suggestions on which PPM size to use.
I also think but am not positive that you would NOT want the Poret foam to be as tall as the tank because as they clog up, water may back up in the sump chamber a bit. If you cut them a couple inches lower, the water will flow over the top of that section and not flood the room.
I don't run sumps but DO use Poret as HMF filters in my fish room tanks and also in my large Eheim filters.
Definitely contact Stephan at swiss tropicals for his suggestions on which PPM size to use.
I also think but am not positive that you would NOT want the Poret foam to be as tall as the tank because as they clog up, water may back up in the sump chamber a bit. If you cut them a couple inches lower, the water will flow over the top of that section and not flood the room.