The Planted Tank Forum - View Single Post - Drilled overflow to canister intake conversion
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Old 12-08-2012, 02:36 PM   #8
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There are some references to bottom drilling in this thread. Check out Wasserpest's post.

As far as preventing your tank draining if the bulkheads leak or the canister's seal was to fail... not much that I can think of. Some people plumb in check valves, but these can certainly fail, although the clear ones could at least allow you to check the inner workings every so often.
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