| Re: How hard is it to..
It's not that difficult to replace the seal. You need to scrape away the old silicone right down to the glass. Clean the glass with some solvent & recaulk with aquarium rated silicone. Silicone does not have good adhesion to already cured silicone.
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We are the people our parents warned us about! JB 
30 gal mixed reef
12 gal mixed Aquapod, 70 W MH
12 gal JBJ cube - mixed reef
12 gal Aquapod - work in progress
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