Hi Jason, and welcome to the forum.
How is your tiger barb this morning?
Could you take small amount of media from the filter on the main tank and put it in the filter on the Bio-orb, so that there is some bacteria in the filter?
I have tiger barbs, and they can be quite hardy. I should imagine that he will survive the move, though if you could get some mature media into the filter, and get a heater soon, that would be good.
How long has that fish been on his own? I mean, the only tiger barb? Keeping them in big groups keeps the chasing and nipping within the group, which would make it safer for the rest of your fish.
I'll admit to being quite fond of slightly odd fish, and would love to see some pictures of your big fish. As a general rule we always nag a new forum user for pictures of their tank, just because we love seeing what people have got.
As for your problems keeping normal fish, large numbers of each species work well, if you have the space. I'll admit to having 24 tiger barbs in a species only Roma 200L tank.
I also have zebra danios in a temperate tank. Well, I only have 1 now, one of the very first fish I ever bought, and she swims with a group of leopard danios.