I would check the ALK mushrooms and Xenia dont have high requirements almost like weed on the other hand for LPS requires ALK and Cal supplementation. Other thing t o consider is placement of the corals in your tank. Since you mentioned you have 400w light i am assuming its one unit and hence...
First i would welcome you to the hobby and second in my opinion you have big fish in small 10 gallon dwarf lion fish requires at least 30 g tank and also you clown is in high risk of getting eaten from what i have heard
forgot to mention about sebae they get huge 10 g with aqua clear any anemone...