Its recommended not to use ABS plumbing on our aquariums. During manufacturing they add something to the plastic to inhibit the growth of bacteria on the pipe. Its not a really potent effect so you can get away with a little but it might not be a good idea to have all of your plumbing done with it. If I didn't need to leave for work right away I'd find some information for you... but I'm running short on time so maybe someone else will chime in.
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