Well a 35 gallon cube is cramming it for any anemones IMO
. Anenomes of all species are tough keepers and both a carpet and Magnifica would outgrow a 35 gallon aquarium if conditions were right and they survived. The only anemone that could possibly work and that your clownfish would host in is a Bubble Tipped Anemones. BTA's again are easier to keep then some anenomes but still are tough keepers in the scheme of things.
Clownfish do not need an anenoome in captivity and will do just fine without one. You could try to get your clowns hosting in a nice colony of frogspawn or torch coral. Those LPS
corals are hardy and do not get large enough to outgrow a 35 gallon aqaurium like an anenome would. In addition to that, often times in the abscence of an anenome clownfish will host in an LPS
or even soft coral.