I had a planted 180w with two cobras and was pretty sucessful. Here was a stock list.
Here is a list of fish in the tank. I'll list them in their pecking order.
2 Convicts : Attack anything that gets near their nest in the skull including the big pike. They even bite me (its like a practical joke hand buzzer it doesnt hurt it just scares the crap out of you if your not ready for it)
2 Cobra Pike : Meaner than a dog sh**ing tacks. The Female hates the convicts but gets double teamed by them.
4 Red Hook Silver Dollars : They arent pirahnas but they still have a set of sharp teeth that gains them respect. When they bite something the scales fly.
2 Red Terrors : The big one is a female the little a male. Lets just say they don't call them terrors for nothing.
2 Veja : I'm not sure what type they are they were sold as red heads. They get meaner by the day. Eventually they will be at the top of the list with the pikes.
1 Jack Dempsey : He's very arggresive during feeding but is falling down the chart as the others get bigger.
1 Sailfin Pleco : The big pike tears into it all the time but its thick hide has saved it so far.
1 Salvini : Fights with the convicts alot but runs from everything else.
The pike ended up killing the pleco, the salvini, and the smaller male red terror. The jack dempsey was taking a beating but the remaining fish held their own very well. So convicts, veja, red terrors and red hook silver dollars all work well as long as they aren't to small.