I have a 29 biocube, reasonably heavily planted, currently under construction. It houses one pretty half-black male guppy, two male Psudomagil Signifer rainbows, a few random neo shrimp, and three pygmy cories. Don't worry, the pygmies are getting friends soon.
The two rainbows were going nuts chasing eachother, so I put one in a mesh hatchery to keep them apart.
Now, the guppy is a horny little bugger, and he was bothering the one that was still in the tank. I put the other rainbow back in the tank to give Bull (the guppy) someone else to chase, and something happened that kind of surprised me.
Both rainbows kind of exploded into full color and started lunging at eachother, spinning in circles and basically just dueling. A lot. Then the guppy dove into the middle (apparently wanted to mate) and got chased away, and now the rainbows are chasing eachother around with the guppy just racing around and looking freaked.
I'm planning to add four females... Would that work?
Is their dueling going to stress them out, or is it okay? They've sure colored up, but I think that's just a display.
Wanna guess why I named the guppy Bull?