I've Neglected My Guppies

[country_who]

 I've been so careful with my fish since I raised them from when they were born, but I introduced two new fish to the mix from the pet store and now my tank in infected with ick. All my babies are floundering around in there. I treated them, but the last time I treated for ick I ended up wiping out any babies in there. The Doctor, Rose, and Donna, are very sick now, especially the Doctor. The two new guppies, the Oncoming Storm and the Bad Wolf are also infected with it. The Oncoming Storm died today and the Bad Wolf seems to be close behind with the rest. I should have noticed that they had ick sooner, but I've been so busy, that I've neglected the poor babies. 

Does anyone know what to do for ick? I've given them a liquid treatment, but I'm still worried...