Unless you buy a proven egg-laying pair, I doubt that you'll get them to breed in 4 months (& if you do, are you prepared to hatch & raise the young fry with all that entails?) It can take longer than that for a pair to figure out the whole dominance/submission roles. I'd suggest you get the great book 'Clownfishes' by Joyce D. Wilkerson for plenty info on captive care, breeding, etc. Good luck!