Would like to get my first Anemone ut have questions

[lightningfront]

I've heard that it is not a good idea to introduce an anemone to a relativly new aquarium. I have a 125 gallon tank (mixed reef) which has around 10 fish my favorite of all the pair of Black & Whihe clowns. The tank has been cycled and has had fish corals and inverts for 3 months. What is the general rule on how long an aquarium need to be established for an anemone?

Also, what is the beast anemone to get for my clowns to host?

 

[Lmecher]

The general rules is around 6 months. The age is not as important as the stability. Anemones do not tolerate change very well.
What kind of lighting do you have?

 

[lightningfront]

Tank is lit with DIY canopy 6 x80w T5s, with Individual Icecap SLR reflectors and high PAR bulbs. Since the T5s were only 5' long on a 6' tank I put 32w PCs on each end to fill in the spaces on the end and allow me to have maximum light in the center of the tank.