You didn't answer any of my questions.
The LED fixture is DIY? How many watts are each LED? Did you use any optics? Depth of tank is important to be able to determine how intense your lights are at the bottom of your tank (I'm not familiar with the depth of the various bow front tanks), I think your tank is probably 21 or 24" deep which makes me think your lights are lacking a bit. The intensity of lighting is very important to determine which species are suitable. You didn't say which species of anemones you are interested in either. Like the various corals available on the market, the various anemones can have quite different requirements!
Need more info.
Given the limited information you provided, it is
likely you should be able to keep a Bubbletip anemone provided you keep it in the upper half of your tank. I wouldn't try any other species without more experience and more intense lighting.