The phrase "this is a difficult balance" is an accurate and acceptable part of written English. You can use it when you want to describe a situation that has both positive and negative aspects that must be taken into consideration. For example, "Negotiating trade agreements is a difficult balance between the interests of businesses and governments.".
This is a difficult balance.
This is a difficult balance to strike.
This is a difficult balance to strike, and the long-term challenge is to somehow maintain this degree of casualness.
"This is a difficult balance to strike, one that this new policy, imposed by executive order, will make harder to achieve in the long run".
This is a difficult balancing act.
This is a difficult balancing act in the best of times.
This is a difficult balancing act, and Cardinal Keith O'Brien made it immeasurably more difficult at the weekend.
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MA of Applied Linguistic, Maquarie University, Australia