Is it safe to level a tank after it's been filled? Everything was level on installation when it was just the tank and stand, but after adding sand and water my tank is a bit tilted to the right. Not a huge amount, but noticeable, on the left: 1 13/16" on the right; 2 2/16" across the 6' length. I know 1/4" doesn't sound like a lot, but it really irks me. The stand has 5 leveling feet in front as depicted below. Can you guys recommend a safe method of squaring this up that won't put the whole shootin' match at risk?