Black rim on top of tank. How important is it?

[Stones]

Originally Posted by burrows14

I was thinking about doing this to my 40 gal breeder Im using as a sump. Would it be less likely to have a problem with a tank that has 4 baffles in it?

The baffles act as braces to keep the front and rear of the tank from bowing so no further bracing is required.