Khulies, yoyo maybe golden. Stay clear of the weather loach as it is cold water. And try to get a minimum of three, more is better and that is wht the khulies are great for smaller tanks. You can get a bunch of them.
Tkos, I have read conflicting things about the Yo-yo. Is it semi-aggressive or not? I have read that it is and that it isn't. I was interested in that but a bit confused by the differing opinions.
My experience with yoyo's is that if there is only one or two they will be agressive towards other fish but if there is atleast a group of 3 they will squabble with each other and leave the other fish alone.
I have 3 yoyos in with cardinal tetras and harlequin rasboras without a problem. There are other fish in the tank too, like swords, rainbowfish, dwarf gourami and most recently a small angelfish. Everyone does fine together.
I tend to like the bandit and skunk cories but it's all a matter of personal taste. I have many types of tetras and they do just fine with a trio of each. In fact, I have a better schooling affect with 3 neon's than when I had 9. Most of the tetras stay to themselves except the cardinals and neon's seem to intermingle. Kyle