In 3/8" you will loose very little clarity.
If you built the tank then just take an exacto and cut out the pane. (Take your time) Make sure ALL the silicone is off and glue in a new pane.
That or paste in a strip over the crack and use lots of sand. 
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150 Gal system 3'x3' 400W M/H, Bekett skimmer, Dart return,1/4 HP Chiller
180 Gal Drop tank, LED lights, Bubble master 250 skimmer,Hammerhead on a closed loop, Speed wave return.
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