Sounds to me like your light may be a bit weak, and you tank is way too young to have an anemone yet. Best bet is to be patient, and not sacrafice the creature. Also remember clowns don't need anemones, although it is cool to see, but many never host at all. If anything, you might try a hardy soft coral like a leather or mushroom, many clowns have been known to host those, and they are much better candidates for your low/med light young setup. Good luck.