This is a common mod within the planted tank community. This is refered to as semi-rimless. This is a great looking setup for a planted aquarium. In a 10 gallon, the pressure will cause no added stress to the glass without the rim.
It was manufactured to seat a hood/lights. In a High Tech Planted Tank, you might see more lighting suspension without the need for this rim, which blocks viewing... IME
-Aaron Gifford
It was manufactured to seat a hood/lights. In a High Tech Planted Tank, you might see more lighting suspension without the need for this rim, which blocks viewing... IME
-Aaron Gifford