Hikari Bacto-Surge High Density Foam Filter, Large

Is there a way to increase the strength of the filter? Do you just buy a stronger air pump?

How many gallons could this handle on its own? I'm running it with another filter but I'm curious about using it to cycle a second tank.

will it fit a fluval 306 intake?

Are there suction cups/does it come with a way to attach it to the aquarium glass?