I think that, as abcha0s mentioned, there are very few things to worry about in your tank... potentially some rarely occuring bacteria... and also the risk of picking up a coral toxin out of the water. The water, the fish poop, the salt... it really is all harmless. I dont enjoy the salty taste... but I have to say that my FW tanks, I would drink out of them any day of the week. I do waterchanges (including cleaning most of the filters) every 5-7 days, with R/O water. I use a 1" ID, 5' piece of spaflex to get the water out... that moves fast, and it isn't rare for me to get a face-full of water nevermind a mouthful. Those fresh tanks even taste good actually! (better than our drinkable well-water).
Anyways im just rambling... but I dont think theres much to worry about. I get the occasional mouthful of water from fresh and salt tanks... I dont have any issues. I used to use pumps, submerging the hose, shaking the ones with flaps... and opted to go back to the good 'ol mouth technique.
Cheers,
Chris
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No more tanks  - Laying off the ReefCrack for awhile!
Cheers,
Chris
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