Weeder...been there, done that--don't recommend it. I ended up returning that anemone to the store.
If you jus want to see your clowns host something, depending on your wattage, you could easily house some leathers that your clowns can grow to love.
Granted, not all clowns have the inclination to host--mine is actually hosting on a dead powerhead atm (I would take it out, but cmon...it's his buddy)...otherwise, I'd leave the anemones alone -.-
No one really mentions either that when an anemone dies, it could wipe out your whole tank as when they release zoo (they will cloud up your tank upon death)...those toxins can kill the livestock in your tank...not worth it in my opinion.
Some clowns are known to host in Hairy Mushrooms, Hammer Corals or even toadstools...they need adequate lighting so you'd want to research on that a bit and/or lighting upgrades...but for a 10 gallon, I'd suggest at least 40 watts of lighting, the more the merrier...I would estimate lower but I'd rather be on the safe-side.