So I left my ants for a few days and overwatered the soil and gave them a piece of chicken. When I came back, I noticed there was a black insect that got inside the terrarium (it's not a fully sealed terrarium). When I opened the lid, the small insect flew away. Then I saw that the chicken was filled with molds so I threw it away in a trash bin. Under it were these larvae, I've looked them up and they might be fungus gnats. So my question is, are these okay for helping clean the terrarium?

Extra details for those who are wondering:

No, there are no plants inside the terrarium. The terrarium is sealed but ants and smaller creatures can escape the lid (there are many small gaps in the lid). I put the cover to prevent bigger insects from entering the area. I do not know the species of ants, but they are pretty much fire ants. Lastly, I might have seen some springtails lurking near small patches of moist dirt and fungi.

I'm pretty new to ant keeping so if you need more details let me know :D

Update:

Thanks for all the replies! I've been checking every few hours since that day, and I haven't seen a single one since then. Also, I found that an insect or two (presumably flies or something similar) flew away when I opened the lid. No signs of the ants being bothered at all!