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That sounds like them. I am now cursing myself for not pouring bleach and alkaseltzer into the tank!

Oh my that's a bit excessive?! XD

For future reference depending on the plant, you can give them a gentle wipedown to get rid of any eggs before adding them to your tank :)

I am an excessive expressive man!! :0D

I shall remember that. I genuinely had no idea that things could hitch a lift but of course, it makes perfect sense