Does this look like...

hello everyone i took a pic of a sick girl today and was wondering if you guys could help?
It looks like some mg deficiency but yall would know best. Any help would be fantastic. some Epson would fix the mg problem right?

first and second pic is the sick one.
last pic is a group shot. no other plants are sick but were potted same time, same soil, same water.
thanks in advance.

Root stunting is characteristic of calcium deficiency, acidity, aluminum toxicity, and copper toxicity. Some species may also show it when boron deficient. The shortened roots become thickened, the laterals become stubby, peg-like, and the whole system often discolours, brown or grey.

It may be over-watering however.. It is in a small cup, so is the water draining? It looks time for a transplant.

Doesn't really look like a magnesium deficiency to me.

how old are they?? they mite just need a lil food if they are over 3 weeks old

thx guys for the advice. the girls are getting fox's bb and the cups have drain holes. Its wierd that only one is sick the others are healthy. it might just be a little to much h2o.

To much water could definitely do it.
No worries!