Have you looked at their web site? If not then please do so. You have to buy the enclosure, kit, and bulbs separately. They lift right off and I feed from the back of the tank so it's no problem for me. The enclosures leave the back strip of a standard glass top uncovered.
The only tank out of my six that has normal gravel is my Shell Dweller tank. The other five all have enriched substrates of one form or another.