new anemone?

[chevyjaxon]

ive had my tank setup 5 weeks now i have a yellow tang 5 damsels a neon wrasse and some crabs i have two skimmers on this setup and a 20 gallon sump i also have a P.C. lighting setup 96w x 2 i want to add a anemone and clownfish real bad. the LFS said I have to wait another 3 months before my tank will be mature enough, oh yeah i got 100 lbs LR and 70 lbs live sand the tank is a 90 gallon any thoughts on adding anemones and clownfish would be appreciated