Ive attempted this and the nutrafin bottle's threads are very coarse and will not hold the pressure. If you want to use a glass diffuser you would need something stronger.
The ceramic is the disc in the middle the rest of the diffuser is glass.
The cheapest one i could find on ebay with a nub that goes into the suction cup as part of the glass. some of the other ones have suction cups that clip on. I think it was $8 for a two pack shipped from hong kong.
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