Itll be fine as long as it steers clear of filter and water change pipe. It probably hitch hiked on one of the plants. If youve got a mature filter spare stick it in to help with any ammonia. Id be much more worried if you had john ines or similar in there. I dont think aqua soil will be as bad for ammonia.
Youll have to call it something daft like 'freddy fry' of 'billy the fish'
It seems ok anyway. Ive knocked the flow down on the filter a little. Its full of mature media from other filters anyway and I have tested the water for ammonia and the filter is mopping it all up well. I never test water for ammonia etc but have with this and 3 days ago I had no ammonia a little nitrite and nitrate and today no nitrite and some nitrate so big water change again and In went all my shrimp 🙂
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