Man you got it all backwards:
You need to use the treasure chest on the dried seahorse to rip it apart, if you do that you'll get the ruby-red chest key, just examine the seahorse remains
Now for the tricky part, you need to use the mysteriously odorless voodoo potion all over the chest but without using it all. Unfortunately if you miss a spot you'll end in the water due to the smelly gas that will get out of the chest
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