Acans have NEVER opened in my tank

I have a 120g mainly LPS tank. Everything looks amazing except my acans . I have tried them in basically every place possible in my tank from the sand bed to high on the rocks and they just don't seem to like me ! I've tried low flow

, high flow , low light , high light and nothing seems to work. They aren't dying but they aren't opening up either so I am at a loss. Can someone tell me if they have had this issue and if so how do I solve it? I love acans but it seems they don't love me at all! Lol