We use one single hunter to kite the adds on 25 man. We've done it since our first kill, regular and heroic. Mages and Boomkins can also do it, or so I hear. Having a 3rd tank just tank them all also helps.
I assume this is 10 man since you have no Death Knight. Adding a 3rd tank is probably unrealistic unless your DPS is amazing. I'd definitely just put a ranged DPS on the little adds and have them kite the adds around. They don't really need traps/slows, they are slow as hell already and move slower than normal player movement speed. Right before the phase change push, I suggest having the rest of your ranged aoe down any remaining parasites so your hunter/whoever is kiting the adds can switch to magmaw in the burn phase.