Ok. Without dosing the whole tank I've decided to use a technique I've done before.
Using a pinch of powder , added some spectrum pellets and a bit of water.
Soaked them in the meds and fed directly to the fish.
You can let the pellets dry out a bit if you like.
Since my female clown looked a bit skinny when I got her I suspected worms.
Using this product ingredients in the past using this method, with stronger doses from the vet I am confident in what's been done will not harm the fish.
Will follow up feeding this mix tomorrow .