Bacteria
Thats what makes me cautious. crazy unknown, unseen and potential for sickness. i am active in my tank and have not always been crazy about hand washing... but its true that some stuff can get you. one thing i would like to point out,in regards To the hobby, is test chemicals. that is some bad ass stuff. if you dont wear gloves while handling these you could have serious long term effects. those pretty symbols on the bottle are there by LAW. ever wonder why? wear gloves. that covers all!
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