Upgrade the lighting and get a bta. They are the hardiest anemones that clowns will host. I have a bta with a pair of O. clowns in a 20gallon with 130 watt pc
light so around 6 wpg
45 x 6 = 270. So I would go with at least a 300 watt fixture to keep it healthy.
If I were you I'd slap on a 400 watt MH
pendant or two 150's or two 250's, but that's just me. They are relatively cheap (around $300) and work well with odd shaped aquariums ( I don't know what shape yours is, like I have a 55 gallon corner tank so the spot light from a MH
in the middle would be good).