besides overwatering being the main factor, make sure that your temp stays steady (between 68*-78*) and doesnt drop below the mid 60s then raise up high, that variation isnt good. also make sure your humidity is constant and not able to spike up real high(need good air ventalation). i had lil mushrooms on my first grow, i realized it was un-steady conditions with overwatering. hope this helps you:thumbsup:

G13Budsmoker:jointsmile::stoned::rastasmoke: