No your good w/ fixture - pull screen back so it's 3/4 on the tank w/ the opening place the uvb width wise across the tank - how tall is your tank we may haft to get it in the tank - you can use picture wire hangers- they are bendable - but you want that uvb 12" above herYes calcium with every single thing she eats. And can you explain more on how to get the uvb lighting inside the screen? Do i have to buy new special hanging hardware and a whole new fixture?