07-15-2012, 03:06 PM
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Well... it sucks, but to be honest, MOST of us on here started out on the wrong foot in almost the exact same way. You and your fishies will get through it - it's really all about learning, and you didn't know any better - I'm betting your sister didn't know, either, so don't be too hard on her :)
I'm not sure what calculator you used, or what research you did prior to this mess, but if you look up the profile for Mollies, you'll find that they have a rather high bioload, and need a tank minimum of 20g. I have Mollies, I ALSO tried to put 2 of them into a 10g tank when I started off. I ALSO learned the hard way about cycling and stocking, and it is from pure experience that I pass this information along to you - a 10g tank is too small for a Molly. I'm sorry. . . look up the needs of that fish almost anywhere, and you should get that information. I won't argue with you about it - but I DO want to make sure you've been informed before any other creature comes to harm.
Good job turning the tank lights off and doing water changes. This will make a huge difference in getting everyone through this - be sure to keep it up for a few weeks. And please, do not add any more fish for a couple of months - if at all. It is really important that you allow your cycle to run its course and establish or you will only make things worse all around. This isn't the fish shop's fault - this is trouble caused by a cycling tank, and adding more fish into it will make more toxins in the water that can harm your existing fishies. . . if you add anything right now, see if you can get some fast-growing stem plants like Hornwort or Anacharis - or a floating plant. These will take in the toxins as 'food' and go a long way in fixing your tank much more quickly.
Best of luck!