Nothing in sections 17a-116 to 17a-120, inclusive, as amended by public act 86-330, shall affect any subsidy granted under the provisions of sections 17a-116, 17a-117, 17a-118, 17a-119 and 17a-120 prior to April 1, 1987, except that any adopting parent may apply for an increase in such subsidy in accordance with the provisions of this section. All subsidies granted on and after April 1, 1987, under said sections, shall be subject to the review provisions of sections 17a-118 and 17a-120. Any adopting parent who received a subsidy under said sections, prior to April 1, 1987, may apply to have said subsidy increased or modified in accordance with the provisions of said sections as amended by public act 86-330. The Commissioner of Children and Families shall notify such adopting parent of the provisions of sections 17a-116 to 17a-120, inclusive, as amended by said public act and of his or her right to seek an increase in such subsidy in accordance with said sections.