Worming tangs in Display

I have a new tang (lieutenant tang) and a regal who I've had for about a year. They are both in my display. My regal's poop is a bit white and stringy and the new one is a bit thin. I'd like to worm both of them.

My question is can I try mushing some prazipro in with their formula two cube and feeding it to them that way? I don't want to do anything that will kill my inverts....
 
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