my fish are dying without water pill, I think the pill is for chlorine?

I do not know what tablet wild, but I'd say chlorine content of water .. stepson told me just before leaving that whenever I can change the water every week, I break a small tablet in the center and pour the contents of the tablet to the new water aquarium. I realized today that there are more compressed. I'll buy it tomorrow, I suffocate fish or wait?

i have to wait until you get more. the tablet is to eliminate chlorine from water. If you change the water change only 25% of it as "bacterial good" need to maintain a healthy number, changing all the water you have to re-grow the good bacteria …

JBL’s ‘NovoTab’ Tablet Fish Food