So, I've had (Woodhouse?) tadpoles for a couple weeks now. For the most part, everything is going well. Most have hindlegs, and one glorious pioneer is already eating fruit flies on land. As a side note, once their front legs appear, it's amazing how quickly the tails are absorbed and they become terrestrial. This one only took four days for that whole process, tops.
That said, there's one tadpole in particular that simply... doesn't seem to be growing, with no signs of legs yet, either. Feeding a diet primarily of frozen romaine and the thinnest cabbage leaves, with a small amount of fish flakes offered every couple days. Water is 75-80 degrees with a partial water changes done every two-three days using treated spring water. I do have an airstone that's on, but only for 30 minutes every three hours.
He's obviously still alive, and IS eating, but I'm honestly puzzled on why he's lagging behind so much. Their wild cohorts are currently hopping around in my backyard, so I realize I'm keeping them a bit cooler (too cold?) than they'd be outside. Anything I seem to be doing wrong? I'm strongly considering releasing the runt back into the wild (with temp acclimation) since, frankly, I don't know what I'm denying him.