Is it safe?

  • We are currently upgrading MFK. thanks! -neo
I'd be more worried about the cat having flea meds or something that can get into the water and poison the fish
 
I would think they would be fine drinking it, but then again my cats would go fishing if I didn't have lids on my tanks, and if I catch them on the top they get a good smack, already had to fish one of them out of my 56 gallon silly cat jumped up on it while I was doing a water change and the lid was off, turned around and heard a splosh and a huge ruckus and there was my 15 pound black soaking wet cat doing the mad scramble trying to get out of the tank, funny as heck!
 
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