yes, its fine. the pistils start to dye and change color as your getting closer to the end of flowering. rule of thumb that iv always followed is when about 75% of the hairs are brown, the plants are ready.
happend to me about 3 weeks ago. lights came on for about 2 minutes. this was during my 4th week in flowering. that was 3 weeks ago, and everything seems to be fine. I thought i saw some weird growth, maybe some stunting, but i think it was just my immagination. You should be a-OK!
also, the air stones used in fish tanks would get cloged preety easily i think. evan tho air would be pumped through it all the time, i think it would clog up preety easily. i used to have fish, and when the watter used to get dirty, the stones would sometimes clog.
the thing is, these are flavors for food. so the buds might taste like bleuberry when you eat them, but while there being burnt(smoked), i think it might get disgusting.