This is a tough, coastal species that can handle relatively poor water quality with temperature and salinity swings (although it is of course best if you can avoid this). The inherent instability of small tanks argue against keeping sensitive species such as Odontodactylus havanensis in them, but species such as G. graphurus, G. glabrous, G. viridis, and G. chiragra can do reasonably well in these conditions. The biggest rist is not to over feed and make sure you remove excess food after a few hours.
G. glabrous is a fairly robust species with a powerful strike for its size. That suggests that a glass tank might be at some risk if you have a large individual (> 65-70 mm). I've never had one break a small glass tank, but I have had them break out of plastic holding cages and containers. Usually there are problems only if the animal tries to dig and hits a corner or bottome edge. If you are worried about this (I'm not because my lab has floor drains), you might lay down thin plexiglass strips to protect the bottom edges of the tank.
Roy