Seedling not growing / seed taproot not growing.

I'm growing in 50/50 coco/perlite, germinated the seeds in rapid rooter cubes. Seedling #1 sprouted on Monday and the seed #2 had a taproot but it hasn't sprouted nor produced roots from the cube.
So it's been a couple days since seedling #1 sprouted and it hasn't grown at all. The stem is about an inch long, but the cotyledons and first set of true leaves look almost exactly the same as when they first opened up. I took the cube out thinking it might be the problem and there are no roots protruding yet at all. Shouldn't the roots have grown enough to be exposed by now? I put the cube back in the coco. Could this be an over watering problem? I have been watering the cube in the coco about every 12 hours.

Also, the other seed still hasn't sprouted. Same problem?

The only problems I can think of are maybe over watering or lack of nutrients. I have only been giving PH 6.0 distilled water so far.

Environment is approx 45% RH and 75 degrees, lights on 24 hours.

Way way way to young for nutes looks good to me except for the huge container stop fucking with it and let it grow they don't look like there doing much when they first sprout but that's because they are trying to establish a root system every 12 hours that's a bit excessive even for coco

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