I have a 6 month old, 50 gal. planted tank. My first and only fish species were 12 small Harlequin Rasboras. I've been focusing on plants, balancing the tank and dealing with the inevitable algae (s). A little over a month ago, I started noticing tiny fry swimming about, hiding among the plants and the driftwood branches. Since then, its been a steady stream of new fry - two or three each week. The adult Harleys don't bother them and the fry eat the "First Bites" fish food daily. My problem is that I now have about 20 or so Harleys. That's enough! I don't envision this being a species tank. I was planning on adding a pressurized Co2 system soon, before I add different fish, as I pretty much have most of the hardware. If I add a couple of Bolivian Rams, what should I expect? Will it discourage or stop the breeding behavior? Will they just eat the fry? Suggestions and insight would be appreciated.