03-16-2014, 03:50 PM
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For the 1.5 you will need a heater if you decide to get a betta. A filter is considered optional for some, but will help with water clarity and adding more volume to the tank/surfaces for bacteria. I like the Azoo Palm Filter for small tanks. You'll also need water conditioner, a favorite for many hobbyists is Prime by Seachem.
I really do recommend that you get the API Master Liquid Test Kit, it is an investment that will last you years, and also save you money in the long run (test strip costs add up quick, especially when you are cycling a tank)
No2 should be 0, and no3 should ideally be less than 20. However these numbers won't show up until you have cycled the tank (and thus made it safe for fish to inhabit.)
I can't tell you if those fish are suitable or not as we don't know the exact tank size you have picked out (bigger is better!), and your waters gh, kh, and ph. The ph test comes with APIs Master Liquid Test Kit, and you can either purchase their gh/ph test kit or find the info on your city's water suppliers website.