I planted some agave seeds about two months ago, which sprouted into 4 or 5 little 0.5 to 1 inch sprouts within a couple of weeks. However, they haven't grown at all since then. I water them about 1/3 as often as I water my other plants, which seems to keep the soil about the right moisture according to my meter. My apartment is usually 65 °F at night and 72 °F during the day, and it's in full sun for most of the day. I've been considering getting a heat lamp for growing the more tropical plants.
Is there anything I'm likely to be doing wrong (it's my first time growing that type of plant)?
Does agave normally stop growing for a while?
Is a heat lamp required for plants like agave?