old tank

[mike31154]

Some bottom plastic trim incorporates a center brace which also supports the bottom glass, both horizontally as well as under the glass to prevent deflection. Not sure if yours would have this, but even with minor cracks on the trim, it's probably worthwhile to keep the trim on there.

[sphelps]

If it's an old tank in general and showing signs of wear and tear and a new tank is available in your budget I would buy a new one. 55 gallons is more than enough to make a huge mess of your place.