Oh yeah. I had missed where he said the size of his tank and had for some reason thought it was a bigger tank. Personally, in order to fix both problems, i would suggest getting another tank of at least 10 gallons. (although if you have the room the bigger the tank the better) and just move some of the fish over. you could place the white cloud minnow into the new tank (after it has cycled of course), that way you can keep the temp cooler like they prefer and also you will have room to get a school of them. also if i'm not mistaken some of your inverts could go into the new tank too.
Or you could place the two Dwarf gourami's into the new tank (although i would only recommend this if you get a 15 or 20 gallon tank.)
happy owner of a wild type GFP axolotl named Percival and too many guppies to count.