Bought at Home Depot, not sure of type, want to make sure they're healthy...
The tallest one has firm leaves and a firm stem. The medium one, with brown on the edges - the outer leaves are a bit squishy, but the interior ones are firm.
The smallest one is clearly suffering - some of the leaves have come off. The smaller, flowering leaves are all dried up and seem to be dead (it came this way).
I've been watering them gently once a week, and bought a grow light that turns on automatically for 6 hours a day (spaced out - 2 hours on, 1 hour off, 2 hours on, etc...).