HI guys and gals. Just got an old 35gal tank 36"x12"x18' did a leek test on tank and no leaks but what I didn't see is that the center support was removed and when I filled it and put on the glass top the front is about just under 1/4" away from the front when the top hits the corners so it's bowing. Should I put in a support across the inside or just not worry about it? The glass looks to be 1/4" thick. Tank on has fish and is running for 6hrs. Please put my mind at rest Help!!!!