I just resealed an old 40 for a frag tank. Not to hard, scraping out the old stuff is a pain. At Menards they had small tubes of aquarium safe silicone, but if you compare the labels carefully you can get a big one for your caulking gun for half the price...same stuff. If you want a really nice finished look it helps to put masking tape about a half inch from the joint on both sides.
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News flash! Local reef tank drains owners bank account.
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