
Я не знаю, нужно ли тире, а так правильно :)

Тире не нужно.
http://www.evartist.narod.ru/text1/42.htm
§79. Тире между подлежащим и сказуемым
10. Тире, как правило, не ставится, если сказуемое выражено прилагательным, местоименным прилагательным, предложно-именным сочетанием.
То есть, иногда ставится.
http://orthographia.ru/punctum_uk.php?rid=46
Однако при сказуемом-прилагательном тире ставится при структурном параллелизме частей предложения, сопровождаемом в устной речи интонационным выделением (ударением) обоих членов предложения: Все в ее облике обращало на себя внимание: взгляд — острый, прическа — мальчишеская, одежда — современная, модная;
Но, я думаю, это не тот случай.

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