Wow! An immense amount of information, I can't thank you all enough and I really do hope they live for a long time, they are great companions. Now that I'm here I might as well ask the remaining questions I have:

1) I'm currently using this filter with the 2.5 gallon tank: Amazon.com: TOM Aquarium Mini Internal Filter 45gph adjustable flow: Pet Supplies
The main reason I chose it was because one it was rated pretty good and two it was quiet filter, I know these frogs become stressed with the slightest vibration. Three, the area where the water sucks in has very little pressure so the frogs are completely safe if they get close so overall it's a very good filter. However, it's a little hard to clean since it's "mini" and I don't have a brush that can fit inside. It's also hard to obtain filters when I need them since they are delivered. I plan on upgrading to a 10 gallon tank in a month or so, are there any recommended quiet filters?

2) I'm using sand aggregate for the bottom only because it's harmless but it's quite hard to re-setup the tank after a good cleaning. I know I can't use small rocks since they can choke on it. Are there any other recommended bottoms aside from sand, or should I just keep the sand, I don't mind the extra work.

3) I use this product for the water conditioning: Name: tetra.jpg Views: 308 Size: 33.7 KBShould I use a different one or will this work fine?

4) What's the recommended feeding schedule? I always read people do every day, others say every two days, and other says 2-3 times a week.

Final Question I promise:
5) I need some what of an instruction on water changing. Currently, I do 50-60% water removal every 2-3 weeks, put new water in a bucket I have, measure the temperature and use the conditioner mentioned on the third question and wait around 40-50 minutes before putting it in the tank. Any recommended methods?