Add CSS class to posts with certain meta key

The good thing about ACF is it comes with lots of functions to check fields. Here is the manual. Are you creating a meta value in addition to the field and it’s value? I’m guessing that you are looking for the value of the bloom field. If that’s so then
get_field('bloom',post->ID)
should be what you’re looking for.
Also as rutec pointed out you closed your if parentheses before the second eval. I’m surprised that doesn’t throw an error.

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