So, I got her a GLASS 5 gallon tank, new lid and a penguin filter. We set it up, ran it for at least a week before getting her any fish. Made sure it was nicely balanced first. Got her two mollies (they're hardy fish, she should do fine with those). Within a week BOTH mollies were dead. From the appearance, the filter was just too strong for them. So.. my fault.
Went back to a smaller filter, a good one rated for smaller tanks. Again, we set it up and had it run for a week before getting her any fish. We went Saturday out to PetSmart and got her an Angelfish. The fish was basically dead by evening.
ARGH! I say... ARGH!
I'm not an inexperience fish tank owner. I had an 80 gallon freshwater tank for around 10 years. Very little problems with my tank, in face ended up with all of my fish out growing my tank, including the pleco I had. My son has a small 2 gallon tank that has been running for several years as well. He currently has a guppy that's been in it for a year. No problems there.
So why is it that my poor daughter can't keep a fish alive? What's the difference between her tank and the others we've had? I don't know. I honestly can't say what's different. I just know that it's driving me batty.