Thank you. I only had 2 ants in there the other day off the grass I'd put in. But certainly worth noting not to put many in at all.
*Update - the black things with the thin tail are mosquito larvae I've decided. Do taddies or froglets eat them at all? Looking online some sites say they do, others say they don't. My froglets spent most of their time out the water now so will they eat something that lives (currently) in the water?