Well, most folks tend to move away from under gravel filters UGF
Most people use hang on back HOB
power filter, or canister filters that sit underneath the aquarium.
Some people even use a small aquarium or "sump" placed inside the stand with elaborate (and very clever) sections that cascade the water through mechanical, chemical, and biological media filters. It is very cool!
It is usually advised to err on the side of too much filtration. So when viewing the stats on the filter boxes, make sure you have enough flow rate and filtration power.
I don't user the Internet for this anymore. This forum has all the info you need!