WHat do you think of livebearers.?

Live bearers are great well except for when they breed then you end up with more than you actually can handle but that's ok the little babies are worth raising. But yeah I know exactly what you mean Ive had raised live bearers for 6 years and yes I need to mix up some new fish. I only have little lemon tetra and a bristle nose pleco left in my 20 long tank and im looking to buy some new and exotic fish. Maybe some cichlids or some sharks. myself but I gotta do some research first and then im going to have to put the last tetra in my 10 gallon before I put the aggressive fishes in that larger tank. I know Im looking for something new something I haven't tried raising before. I was thinking of doing some research on some puffer fish but Im not sure if im actually ready to maintain the small salt level and the hardness for those sensitive guys just yet.