thanks guys!!
heres an update:
This morning i filled the tank(about 13 hours ago) and its still holding fine. no bowing or leaks all.
I got a little but more done today. Not alot of trim. i may just skip that, or wait it out for a while. I only trimed around the viewing area, as i thought it needed it. one more painting should do it also.
For the glass tops, i made a frmae for them, so they dont slide around, and they are easier to put back in the right place, ect... glass tops are from a dismantled scratched up 15gal tank which would explain he scratcheds on the glass, but their not important.
I also put a handle on the front pieces that lift up and painted them black as well.
sand is only in there for a rince and because i wanted to see what it would look like. so the water is cloudy because of it.