02-08-2012, 12:05 PM
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Do you know your water parameters, particularly the pH, GH (Hardness), and KH (Alkalinity)?
If you don't some pet stores will test it for free (I know Petsmart does). You can also try looking at your water department's website (or call them). I wouldn't buy a kit just for GH and KH as you only need to do it once.
I ask because you have Platies which are live bearers, and they need hard & basic water. The others are soft & acidic fish.
The Cherry Barb
is a schooling fish, which means you need at least 6 of them.
The blue bar at the top of the pages here has a link for Tropical Fish Profiles. I would go there and look up each one, there is lots of valuable information for each of the fish you have selected.