HELP - Sick guppy? Possible ich?

brooke

New Fish
Feb 28, 2017
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[GALLERY=media, 803]20170228_225145 by brooke posted Feb 28, 2017 at 10:59 PM[/GALLERY]Hello - my daughter got three new guppies about a month ago. We think one is pregnant, but upon noticing this and moving her to a different tank, my daughter noticed a white spot on one of the others - on the tail fin. A day later, the spots have spread and she said it looks like it's tail fin is "decaying". She thinks the other male guppy may also be getting a spot on his tail now, but isn't sure. We're hoping we got the female out in time in case this is something that can spread. This isn't the greatest picture, but best we could get...can definitely see the bigger white spot on the tail fin. Any ideas? Can we help this fish? Thank you!